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Class 10 Science Assignments

We have provided below free printable Class 10 Science Assignments for Download in PDF. The Assignments have been designed based on the latest NCERT Book for Class 10 Science . These Assignments for Grade 10 Science cover all important topics which can come in your standard 10 tests and examinations. Free printable Assignments for CBSE Class 10 Science , school and class assignments, and practice test papers have been designed by our highly experienced class 10 faculty. You can free download CBSE NCERT printable Assignments for Science Class 10 with solutions and answers. All Assignments and test sheets have been prepared by expert teachers as per the latest Syllabus in Science Class 10. Students can click on the links below and download all Pdf Assignments for Science class 10 for free. All latest Kendriya Vidyalaya Class 10 Science Assignments with Answers and test papers are given below.

Science Class 10 Assignments Pdf Download

We have provided below the biggest collection of free CBSE NCERT KVS Assignments for Class 10 Science . Students and teachers can download and save all free Science assignments in Pdf for grade 10th. Our expert faculty have covered Class 10 important questions and answers for Science as per the latest syllabus for the current academic year. All test papers and question banks for Class 10 Science and CBSE Assignments for Science Class 10 will be really helpful for standard 10th students to prepare for the class tests and school examinations. Class 10th students can easily free download in Pdf all printable practice worksheets given below.

Topicwise Assignments for Class 10 Science Download in Pdf

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Frequently Asked Questions by Class 10 Science students

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Assignments For Class 10 Science

Assignments for Class 10 Science have been developed for Standard 10 students based on the latest syllabus and textbooks applicable in CBSE, NCERT and KVS schools. Parents and students can download the full collection of class assignments for class 10 Science from our website as we have provided all topic wise assignments free in PDF format which can be downloaded easily. Students are recommended to do these assignments daily by taking printouts and going through the questions and answers for Grade 10 Science. You should try to do these test assignments on a daily basis so that you are able to understand the concepts and details of each chapter in your Science book and get good marks in class 10 exams.

Important Questions and Answers for Class 10 Science

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All students studying in Grade 10 Science should download the assignments provided here and use them for their daily routine practice. This will help them to get better grades in Science exam for standard 10. We have made sure that all topics given in your textbook for Science which is suggested in Class 10 have been covered ad we have made assignments and test papers for all topics which your teacher has been teaching in your class. All chapter wise assignments have been made by our teachers after full research of each important topic in the textbooks so that you have enough questions and their solutions to help them practice so that they are able to get full practice and understanding of all important topics. Our teachers at https://www.assignmentsbag.com have made sure that all test papers have been designed as per CBSE, NCERT and KVS syllabus and examination pattern. These question banks have been recommended in various schools and have supported many students to practice and further enhance their scores in school and have also assisted them to appear in other school level tests and examinations. Its easy to take print of thee assignments as all are available in PDF format.

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All free Printable practice assignments are in PDF single lick download format and have been prepared by Class 10 Science teachers after full study of all topics which have been given in each chapter so that the students are able to take complete benefit from the worksheets. The Chapter wise question bank and revision assignments can be accessed free and anywhere. Go ahead and click on the links above to download free CBSE Class 10 Science Assignments PDF.

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CBSE Worksheets for Class 10 Science

CBSE Worksheets for Class 10 Science: One of the best teaching strategies employed in most classrooms today is Worksheets. CBSE Class 10 Science Worksheet for students has been used by teachers & students to develop logical, lingual, analytical, and problem-solving capabilities. So in order to help you with that, we at WorksheetsBuddy have come up with Kendriya Vidyalaya Class 10 Science Worksheets for the students of Class 10. All our CBSE NCERT Class 10 Science practice worksheets are designed for helping students to understand various topics, practice skills and improve their subject knowledge which in turn helps students to improve their academic performance. These chapter wise test papers for Class 10 Science will be useful to test your conceptual understanding.

Board: Central Board of Secondary Education(www.cbse.nic.in) Subject: Class 10 Science Number of Worksheets: 15

CBSE Class 10 Science Worksheets PDF

All the CBSE Worksheets for Class 10 Science provided in this page are provided for free which can be downloaded by students, teachers as well as by parents. We have covered all the Class 10 Science important questions and answers in the worksheets which are included in CBSE NCERT Syllabus. Just click on the following link and download the CBSE Class 10 Science Worksheet. CBSE Worksheets for Class 10 Science can also use like assignments for Class 10 Science students.

• CBSE Worksheets for Class 10 Science Acids Bases and Salts Assignment
• CBSE Worksheets for Class 10 Science Carbon And Its Compounds Assignment 1
• CBSE Worksheets for Class 10 Science Carbon And Its Compounds Assignment 2
• CBSE Worksheets for Class 10 Science Collection of important questions Assignment
• CBSE Worksheets for Class 10 Science Human Eye And Colourful World Assignment
• CBSE Worksheets for Class 10 Science Magnetic Effects Of Current Assignment 1
• CBSE Worksheets for Class 10 Science Magnetic Effects Of Current Assignment 2
• CBSE Worksheets for Class 10 Science Reflection & Refraction Of Light Assignment
• CBSE Worksheets for Class 10 Science Assignment 1
• CBSE Worksheets for Class 10 Science Assignment 2
• CBSE Worksheets for Class 10 Science Assignment 3
• CBSE Worksheets for Class 10 Science Assignment 4
• CBSE Worksheets for Class 10 Science Assignment 5
• CBSE Worksheets for Class 10 Science Assignment 6
• CBSE Worksheets for Class 10 Science Assignment 7

Advantages of CBSE Class 10 Science Worksheets

• By practising NCERT CBSE Class 10 Science Worksheet , students can improve their problem solving skills.
• Helps to develop the subject knowledge in a simple, fun and interactive way.
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Worksheets of CBSE Class 10 Science are devised by experts of WorksheetsBuddy experts who have great experience and expertise in teaching Maths. So practising these worksheets will promote students problem-solving skills and subject knowledge in an interactive method. Students can also download CBSE Class 10 Science Chapter wise question bank pdf and access it anytime, anywhere for free. Browse further to download free CBSE Class 10 Science Worksheets PDF .

Now that you are provided all the necessary information regarding CBSE Class 10 Science Worksheet and we hope this detailed article is helpful. So Students who are preparing for the exams must need to have great solving skills. And in order to have these skills, one must practice enough of Class 10 Science revision worksheets . And more importantly, students should need to follow through the worksheets after completing their syllabus.  Working on CBSE Class 10 Science Worksheets will be a great help to secure good marks in the examination. So start working on Class 10 Science Worksheets to secure good score.

CBSE Worksheets For Class 10

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Class 10 Science Chapter 2 Board Questions

Class 10 Science Chapter 2 Board Questions of Acids, Bases and Salts including last 10 years papers questions, important and frequently asked questions in CBSE Board with suitable answers of 1 mark, 2 marks, 3 marks and 5 marks questions with equations and answers. These set of questions contains last 5 years CBSE Questions with answers, important questions from last ten years, questions from CBSE Sample papers which are related to Class 10 Science Chapter 2 Acids, Bases and Salts for new academic session 2024-25.

Class 10 Science Chapter 2 Board Questions with answers including last 5 years papers and all questions from last 5 years papers for the preparation of academic session 2024-25. Answers of all questions are given just below of all questions. For NCERT Solutions 2024-25 visit to NCERT Sols main page or you may download Tiwari Academy Apps working Offline as well as Online.

10th Science Chapter 2 Board Questions Set – 1 (1 Mark)

How will you test for the gas which is liberated when hydrochloric acid react with an active metal [cbse 2012].

Bring a burning matchstick near the gas. It burns with pop sound showing that it hydrogen.

Write the name and chemical formula of the products formed by heating Gypsum at 373K. [CBSE 2010]

CaSO₄.2H₂O → CaSO₄.1/2 H₂O + 3/2 H₂O

The PH of the sample of the vegetable soup was found to be 6.5. How is this soup like to taste? [CBSE 2010]

The taste will be slightly sour as it is weakly acidic.

Which base are called alkalies? Give an example of alkalies. [CBSE 2010]

Soluble bases are called alkalis.

Write the name and the chemical formula of the product formed by the action of chlorine on slaked lime? [CBSE 2010]

Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

Na₂CO₃ + 2HCL → 2NaCl + CO₂ + H₂O

Write a balanced chemical equation for a neutralization reaction. Mentioning the physical state of the reactant and the product? [CBSE 2010]

NaOH + HCL → NaCl + H₂O

During summer season a milkman usually adds a very small amount of baking soda to fresh milk. Give one reason. [CBSE 2009]

Milkman adds a very small amount of baking soda so as to prevent spoilage of milk. It leads to change in pH which does not allow bacteria and enzymes to act and milk does not become sour due to fermentation.

Curd is not kept in copper and Brass Utensils

Curd and sour substance contain acids which react with brass and copper vessels to form poisonous salts which are harmful for our health.

10th Science Chapter 2 Board Questions Set – 2 (1 Mark)

Name the gas usually liberated when a dilute acid react with a metal. what happen when burning candle is brought near this gas. [cbse 2009].

H2 gas is liberated. It burns with pop sound it burns with pop sound when burning candle is brought near the gas.

Fresh milk has a pH of 6. When it changes into curd will its pH value increases or decreases why? [CBSE 2009]

Its pH will decrease because curd is sour in taste due to presence of acid in it.

What would be the colour of litmus in a solution of sodium carbonate? [CBSE 2009]

The red litmus will change to blue in sodium carbonate solution.

What effect does an increase in concentration of H⁺ in a solution have on the pH of solution? [CBSE 2009]

Higher the concentration lower will be pH of the solution.

Which one of these has a higher concentration of H⁺ ions? 1 M HCl or 1 M CH₃COOH. [CBSE 2009]

1 M HCl has higher concentration of H⁺ ions.

Why does 1M HCl solution have a higher concentration of H⁺ ions than 1 M CH₃COOH solution? [CBSE 2009]

1 M HCl has higher concentration of H+ ions because it ionises completely in aqueous solution whereas CH₃COOH does not as it is weak acid.

Which gas is generally liberated when a dilute solution of hydrochloric acid react with an active metal? [CBSE 2009]

Hydrogen gas is liberated when active metal reacts with dilute hydrochloric acid. Zn + 2HCl → ZnCl₂ + H₂

What is the colour of litmus solution of ammonium hydroxide? [CBSE 2009]

Red litmus will turn into blue in ammonium hydroxide.

Flow of Acid Rain into in a River

Flow of acid rain water into the river lower the pH of rainwater which make the aquatic life difficult to survive in rain water. For survival of aquatic lives the suitable pH range must be 7.0 to 7.8.

10th Science Chapter 2 Board Questions Set – 3 (1 Mark)

Which gas is evolved when sodium hydrogen carbonate reacts with hydrochloric acid [cbse 2009].

Carbon Dioxide gas is evolved.

On adding dilute hydrochloric acid to copper oxide powder the solution formed is blue-green colour to the solution. Predict the new compound formed which imparts a blue green colour to the solution. [CBSE 2008]

The name of the compound formed is copper chloride gives blue green colour to the solution. CuO + 2HCl → CuCl₂ + H₂O

How is the pH of solution of an acid influence when it is diluted? [CBSE 2008]

When acid is diluted H+ Concentrated in mole/L will decrease and pH will increase.

How does the pH of the solution change when a solution of a base is diluted? [CBSE 2008]

pH of a base solution decreases on dilution.

Arrange the following in an increasing order of their pH value: NaOH solution, Blood, lemon juice. [CBSE 2008]

Lemon Juice → Blood → NaOH solution

Why should water be never added dropwise to concentrated sulphuric acid? [CBSE 2007]

It is because the process is highly exothermic and beyond control and bottle may break.

Carbon dioxide.

A compound which is prepared from gypsum has the property of hardness when mixed with proper quantity of water. Identify the compound and write its chemical formula. [CBSE 2011]

The compound is Plaster of Paris, CaSO₄.½ H₂O.

Two Salts Belonging to Sodium Family

1. Sodium Carbonate 2. Sodiumhydrogen Carbonate

10th Science Chapter 2 Previous Years Papers Set – 4 (2 Marks)

What is neutralization reaction give one example. [cbse 2011].

The reaction in which acids reacts with base to form salt and water.,

Example: NaOH + HCl → NaCl + H₂O

State the chemical name of plaster of Paris. Write a chemical equation to show the reaction between Plaster of Paris and water. [CBSE 2011]

Calcium sulphate hemihydrate

CaSO₄.½ H₂O + 3/2 H₂O → CaSO₄.2H₂O

State in brief preparation of washing soda from baking soda. Write balanced chemical equation involved. [CBSE 2011]

Sodium hydrogen carbonate (baking soda) on heating gives sodium carbonate which on recrystallisation gives washing soda.

2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O Na₂CO₃ + 10.H₂O → Na₂CO₃.10H₂O

What is the colour of FeSO4. 7H2O crystals? How does this colour change upon heating? Give balanced chemical equation for the changes. [CBSE 2011]

Pale green is the colour of FeSO₄.7H₂O crystals. It became dirty white on heating.

FeSO₄.7H₂O → FeSO₄ + 7H₂O

Classify the following salts into acidic, basic and neutral: Potassium sulphate, Ammonium chloride, Sodium carbonate, Sodium chloride. [CBSE 2011]

Neutral: Potassium sulphate, Sodium Chloride

Acidic: Ammonium Chloride

Basis: Sodium Carbonate

A student dropped few pieces of marble in dilute HCL contained in a test tube. The evolved gas was passed through lime water. (i) What change would be observed in lime water? (ii) Write the balanced chemical equation for the above change? [CBSE 2011]

(i) Lime water will turn milky due to formation of calcium carbonate.

(ii) Ca(OH)₂ + Cl₂ → CaCO₃ + H₂O

What happen when chlorine is passed over slaked lime at 313K? Write chemical equation of the reaction involved and state two uses of the product obtained. [CBSE 2010]

Bleaching powder is formed. Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

Uses: (i) It is used as bleaching agent in paper and textile industry. (ii) It is used as disinfectant in purification of drinking water.

Baking Powder

Baking powder is a mixture of sodium hydrogen carbonate and tartaric acid. On heating it liberates carbon dioxide which make the cake soft and spongy.

10th Science Chapter 2 Previous Years Papers Set – 5 (2 Marks)

Tooth enamel is one of the hardest substance in our body. how does it undergo damage due to eating chocolates and sweets hoe does tooth paste prevent this damage [cbse 2009].

Tooth enamel is made up of calcium phosphate. Chocolates and sweets produce acid in our mouth which react with enamel (calcium phosphate) and leads to cavities. We should brush our teeth after every meals as well as after eating sweet etc.

(i) Name the product formed when sodium hydrogen carbonate is heated. (ii) Write the chemical equation for the reaction involved in the above. [CBSE 2009]

(i) When sodium hydrogen carbonate is heated, sodium carbonate carbon dioxide and water are formed.

(ii) 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

A compound X of sodium is commonly used in kitchen for making crispy pakoras. It is also used for curing acidity in the stomach. Identify X What is its chemical formula? State the reaction which take place when it is heated during cooking. [CBSE 2008]

X is sodium hydrogen carbonate. It is used for crispy pakora. It is use for curing acidity in the stomach. Its chemical formula is NaHCO₃. It decomposes to sodium carbonate, carbon dioxide and water on heating. 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

Write the chemical formula for bleaching powder. How is bleaching powder prepared? For what purpose it is used in paper factories? [CBSE 2008]

Bleaching powder is CaOCl₂. It is prepared by reaction slaked lime [ca(OH)2] with dry chlorine gas. Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O It is used as bleaching agent in paper industry.

Given below are the pH value of four different liquids: 7.0, 14.0, 4.0, 2.0. Which of these could be that of (i) Lemon juice (ii) Distilled Water (iii) 1M Sodium Hydroxide Solution (iv) Tomato Juice? [CBSE 2006]

(i) Lemon juice = 2.0

(ii) Distilled Water = 7.0

(iii) 1M Sodium Hydroxide Solution = 14.0

(iv) Tomato Juice = 4.0

Bases are Different from Alkalis

Bases which are soluble in water and produce OH- ions are called alkalis. Some example are: Sodium Hydroxide NaOH → Na+ + OH- Potassium Hydroxide KOH → K+ + OH-

10th Science Chapter 2 Ten Years Papers Set – 6 (3 Marks)

(a) write the name given to the bases that are highly soluble in water. give an example. (b) how is tooth decay related to ph how can it can be prevented (c) why does bee sting cause pain and irritation rubbing of baking soda on the sting area gives relief how [cbse 2012].

(a) Alkali example NaOH (sodium carbonate)

(b) Lower the pH more will be tooth decay. Acids reacts with Ca₃(PO₄)₂ and cause tooth decay. It can be prevented by brushing our teeth after every meal.

(c) It is due to formic acid. Sodium hydrogen carbonate (Baking Soda) neutralize formic acid giving relief.

A white powder is added while baking bread and cakes to make them soft and fluffy. Write the name of the powder? Name its main ingredient. Explain the function of each ingredient. Write the chemical reaction taking place when powder is heated during baking. [CBSE 2012]

Baking Powder. It is consisting of sodium hydrogen carbonate and tartaric acid. Sodium hydrogen carbonate gives CO₂ which makes cake soft and fluffy. Tartaric acid neutralizes the bitterness due to sodium carbonate produced. 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

Sodium hydrogen carbonate is a basic salt. Justify the statement. How it is converted into washing soda? Explain. [CBSE 2012]

Sodium hydrogen carbonate is a salt of sodium hydroxide (strong base) and carbonic acid). It is basic salt. It is converted into baking soda by heating followed by the crystallization.

What are strong acid and weak acids? Identify the strong and weak acid from the following: Hydrochloric acid, formic acid, acetic acids, nitric acids. [CBSE 2012,2011]

Strong acids are completely ionized in aqueous solution example H₂SO4 (sulphuric acid).

Weak acids are partially ionized in aqueous solution for example CH₃COOH (Acetic acid).

Strong acids: Hydrochloric acids, Nitric acid

Weak acids: Acetic acid, Formic acid

(a) What is universal indicator? (b) Write the chemical equation involved in the preparation of sodium hydroxide. Name the Process. [CBSE 2011]

(a) Universal indicator is mixture of synthetic indicators which is used to find pH of the solution.

(b) 2NaCl + 2H₂O → 2NaOH + H₂ + Cl₂ It is known as Chlor-Alkali process.

A gas X react with lime water and forms a compound Y which is used as bleaching agent in chemical industry. Identify X and Y. Give the chemical equation of the reaction involved. [CBSE 2011]

Chlorine gas reacts with lime water to form bleaching powder which is used as a bleaching agent in chemical industry. Hence, the species X is Chlorine gas and the species Y is Bleaching powder with formula -Ca(OCl)₂. Ca(OH)₂. 2Ca(OH)₂ + 2Cl₂ → Ca(OCl)₂ + CaCl₂ + 2H₂O.

Plaster of Paris

Calcium sulphate hemihydrate. Its prepared by heating gypsum at 373K CaSO4.2H2O → CaSO4.1/2 H2O + 3/2 H2O (i) It is used to prepare chalks. (ii) It is used to make casts and mould.

10th Science Chapter 2 Ten Years Papers Set – 7 (3 Marks)

(i) name the compound which is obtained from baking soda and is used to remove permanent hardness of water. (ii) write its chemical formula. (iii) what happen when it is recrystallized from its aqueous solution [cbse 2011].

(i) Sodium carbonate is obtained from baking soda and it is used to remove hardness of water.

(ii) Na₂CO₃

(iii) It changes to washing soda Na₂CO₃.10H₂O

A compound which is prepared from gypsum has the property of hardness when mixed with proper quantity of water. [CBSE 2009](i) Identify the compound (ii) Write the chemical equation for the preparation. (iii) Mention one important use of its compound. [CBSE 2011]

(i) Plater of Paris.

(ii) CaSO₄.2H₂O→ CaSO₄.½ H₂O + 3/2 H₂O

(iii) It is used for plaster fractured bones.

What is neutralisation reaction? Give two examples. [CBSE 2011]

The reaction between the acid and base to form salt and water is called neutralisation reaction, for example: KOH + HNO₃ → KNO₃ + H₂O 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

What is tooth enamel chemically? State the condition when it start cording. What happen when food particles left in the mouth after eating degrade? Why does doctor suggest use of tooth powder /toothpaste to prevent tooth decay? [CBSE 2011]

It is made up of calcium phosphate. It starts corroding by acid formed in mouth. These food particles left in moth to form acids which cause tooth decay. Tooth paste and tooth powder are basic and neutralize acid formed in mouth which prevent tooth decay.

What is baking soda chemically called? Give reaction involved in its preparation. Write one of its uses. [CBSE 2011]

Sodium hydrogen carbonate. NH₃ + CO₂ + H₂O + NaCl → NaHCO₃ + NH₄Cl It is used an antacid.

(a) What is an alkali? Give an example. (b) Why do HCL, HNO3, etc. show acidic characters in aqueous solution while solution of compound like alcohol and glucose do not show acidic character? [CBSE 2011]

(a) Soluble base are called alkalis. Example Sodium hydroxide is an alkali.

(b) HCl, HNO₃ ionise in aqueous solution where alcohol and glucose do not show acidic character because they do not ionize in aqueous solution.

Bleaching Power

Chemical name of bleaching powder is calcium oxychloride. Formula: CaOCl2 On exposure to air, it absorbs moisture. Uses: (i) As an oxidising agent in chemical industries. (ii) For disinfecting drinking water to make it free from germs.

10th Science Chapter 2 Ten Years Papers Set – 8 (3 Marks)

Name the product formed in each case when (a) hydrochloric acids reacts with caustic soda. (b) granulated zinc react with caustic soda. (c) carbon dioxide is passed into lime water. [cbse 2009].

(a) Sodium chloride and water is formed. NaOH + HCl → NaCl + H₂O

(b) Sodium zincate and H₂ are formed. Zn + 2NaOH → Na₂ZnO₂ + H₂

(c) calcium carbonate and water are formed. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

(a) Why does aqueous solution of an acid conduct electricity? (b) How does the concentration of hydronium ions [H3O+] change when a solution of an acid is diluted? (c) Which has a higher pH value a concentration or dilute solution of hydrochloric acid? (d) What would you observe on adding dilute hydrochloric acid to (i) solid sodium carbonate placed in a test tube? (ii) Zinc metal in a test tube? [CBSE 2008]

(a) It is because aqueous solution of acid contain ions which carry current.

(b) When solution is diluted, the conc. Of [H₃O⁺] decrease.

(c) Dilute solution of HCl will have higher pH than conc. solution

(d) (i) Brisk effervescence due to colourless carbon dioxide gas are evolved. Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O (ii) Bubbles due to colourless odourless hydrogen gas are formed. Zn + 2HCl → ZnCl₂ + H₂

While constructing a house, a builder selects marble flooring and marble table top for the kitchen where vinegar and juices of lemon tamarind etc., are more often used for cooking. Will you agree to this selection and why? [CBSE 2010]

No, this selection is wrong.

Vinegar and juices of lemon, tamarind etc., are acidic solution. Acids react with marble flooring and marble table top. Marble is calcium carbonate which react with acids. For example, CaCO₃ + 2CH₃COOH → (CH₃COO)₂Ca + H₂O

Five solution A, B, C, D and E showed pH as 4,7,1,11, and 9 respectively when tested with universal indicators. Which solution is (i) Neutral (ii)Strongly alkaline (iii) Strongly acidic (iv) Weakly acidic and (v) Weakly alkaline. Arrange the PH in increasing order of hydrogen ion concentration. [CBSE 2011]

(i) Solution B is neutral.

(ii) Solution D is strongly alkaline.

(iii) Solution C is strongly acidic.

(iv) Solution A is weakly acidic.

(v) Solution E is weakly alkaline.

You have been provided with three test tube. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube? [CBSE 2011]

(i) Put red litmus papers one by one in each test tube. The test tube in which the red litmus paper turns blue contains a basic solution. There will be no effect on the red litmus paper in the other two test tubes.

(ii) Remove the litmus paper which turned blue and put it one by one in the other test tubes. The tube that turns blue litmus red contains acidic solution.

(iii) The tube which has no effect on the litmus paper contains distilled water.

A student dropped a few pieces of marble in dilute hydrochloric acid, contained in a test tube, the evolved gas was then passed for a long time through lime water. What changes would be observed in lime water? Write balanced equations for both the changes observed. [CBSE 2013]

(i) On adding pieces of marble in the test tube containing dil. HCL, a brisk evolution of CO₂ takes place. Carbon dioxide when passed through lime water turns it milky because of the formation of insoluble calcium carbonate. CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

(ii) If CO₂ is continuously passed for a long time, the mikliness disappears due to the formation of soluble sodium hydrogen carbonate. CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂

Rock salt is the common name for the mineral “halite”. Its chemical formula is NaCl. It may be white or light blue or yellow depending upon impurities present in it.

10th Science Chapter 2 Ten Years Papers Set – 9 (3 Marks)

(a) write the formula and chemical name of bleaching powder. (b) write the chemical equation to represent the action of atmosphere co2 gas on bleaching powder when exposed in open. (c) why is bleaching powder used in water treatment plants [cbse 2013].

(a) Formula of bleaching powder is CaOCl₂ and the chemical name is calcium oxychloride.

(b) Bleaching powder has a tendency to decompose on exposure to atmospheric CO₂. CaOCl₂ + CO₂ → CaCO₃ + Cl₂ It releases chlorine gas and loses its activity as a bleaching agent.

(c) It releases chlorine gas which kills bacteria in water and makes it safe for drinking.

(a) Three acidic solutions A, B and C have pH = 0, 3 and 5 respectively. (i) Which solutions has highest concentration of H⁺ ions? (ii) Which solution has the lowest concentration of H⁺ ions? (b) How concentrated sulphuric acid can be diluted? Describe the process. [CBSE 2015]

(a) (i) Solution A has the highest concentration of H⁺ ions. (ii) Solution C has the lowest concentration of H⁺ ions.

(b) While diluting concentrated sulphuric acid, water is not added to the acid, rather acid is added to water. Take some water in a beaker. Add concentrated sulphuric acid I small lots to water. Stir the mixture with glass rod constantly. Cool the beaker under water if it becomes hot.

Define water of Crystallisation with two examples. How will you prove their existence in the examples given by you? [CBSE 2015]

Number of fixed water molecules associated with one formula unit of a substance is called water of Crystallisation. Examples: CaSO₄.2H₂O and CuSO₄.5H₂O

(i) Gypsum on heating loses half molecules of water and forms plaster of Paris. CaSO₄.2H₂O → CaSO₄.½ H₂O + 1½ H₂O On adding water, it again converts to gypsum.

(ii) Copper sulphate on heating loses water molecules and is converted to white anhydrous CuSO₄. On adding water to anhydrous copper sulphate, the blue colour of copper sulphate is restored. CuSO₄.5H₂O → CuSO₄ + 5H₂O

(a) Define olfactory indicators. Name two substances which can be used as olfactory indicators. (b) Choose strong acids from the following: CH₃COOH, H₂SO₄, H₂CO₃, HNO₃ [CBSE 2016]

(a) Indicators which work on the basis of odour are called olfactory indicators. Onion and vanilla can be used as olfactory indicators.

(b) H₂SO4 and HNO3 are strong acids out of the four acids given.

Name of type of chemical reaction represented by the following equation: (i) CaO + H₂O → Ca(OH)₂ (ii) 3BaCl₂Al₂(SO₄)₃ → 2AlCl₃+ 3BaSO₄ (iii) 2FeSO₄ → Fe₂O₃ + SO₂+SO₃ [CBSE 2016]

(i) Combination reaction.

(ii) Double displacement reaction.

(iii) Decomposition reaction.

Universal Indicator

A universal indicator is a mixture of several indicators. It shows different colour at different colour at different concentration of H+ ions concentration.

10th Science Chapter 2 Previous Years Papers Set – 10 (5 Marks)

(a) identify the acid and base whose combination forms the common salt that you use in your food. write the formula and the chemical name of this salt. name the source from where it is obtained. (b) what is rock salt mention its colour and reason due to which it has this colour. (c) what happen when electricity is passed through brine write the chemical equation for it. [cbse 2012].

(a) HCl is acid and NaOH is base whose combination forms the common salt. Its formula is NaCl(Sodium chloride) It is obtained from sea water.

(b) Rock salt is the common name for the mineral “halite”. Its chemical formula is NaCl. It may be white or light blue or yellow depending upon impurities present in it.

(c) 2NaCl + 2H₂O → 2NaOH + H₂ + Cl₂

(i) Dry pellets of a base X when kept in absorb moisture and turns sticky. The compound is also formed by Chlor-Alkali process. Write chemical name and formula of X. Describe the Chlor-Alkali process with balanced chemical equation. Name the type of reaction occurs when X is treated with dilute hydrochloric acid, write the chemical equation. (ii) While diluting an acid Why is it recommend that the acid should be added to water and not water to the acid. [CBSE 2012]

(i) X is sodium hydroxide NaOH When sodium chloride solution (brine solution) is electrolyzed, sodium hydroxide solution is formed H₂ and Cl₂ gases are liberated. This is Chlor-Alkali process. 2NaCl + H₂O → 2NaOH + H₂ + Cl₂ NaOH + HCl → NaCl₂ + H₂O The above reaction is neutralizing reaction.

(ii) It is because process is highly exothermic. If water is acid, bottle of acid will break.

(a) Identifying the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Write its chemical name and formula? How it is manufactured. Write the chemical equation of the reaction involved. (b) Write the balanced chemical equation of the Chlor-Alkali process? [CBSE 2012]

(a) The compound is bleaching powder(CaCl₃)₂ Its chemical name is oxychloride. It is manufactured by reaction of solid slaked lime with dry chlorine gas. Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

(i) It is used as disinfectant. (ii) It is used for preparation of chloroform.

(a) Mention the pH range within which our body works. Explain how antacid acids give relief from acidity Write the name of one such acid. (b)Fresh milk has the pH of 6. How does the pH will change as it turns to curd? Explain your answer. (c) A milk man added a very small amount of baking soda to fresh milk Why the milk takes a longer time to set as curd. (d) Mention the nature of the tooth paste how do they prevent tooth decay. [CBSE 2012]

(a) Our stomach has pH equal to 2. Antacids neutralizes excess of acid in our body and give relief from hyperacidity. Sodium hydrogen carbonate is one of the antacids.

(b) pH will decrease as it turns to curd because curd is acidic due to the presence of lactic acid?

(c) It takes longer time to set as curd as bacteria do not work well in presence of sodium hydrogen carbonate that’s why fermentation will take place slowly.

(d) Tooth paste are basic in nature. They neutralize the acids formed in mouth which causes tooth decay.

Crystalisation of Water

Water of crystallisation is the fixed number of water molecules present in one formula unit of the compound.

10th Science Chapter 2 Previous Years Papers Set – 11 (5 Marks)

(a) define a universal indicator. mention its one use. (b) solution a gives pink colour when a drop of phenolphthalein indicators is added to it. solution b gives red colour when a drop of methyl orange is added to it. what type of solution are a and b and which one of the solution a and b will have a higher ph value (c) name one salt whose solution has ph more than 7 and one salt whose solution has ph less than 7. [cbse 2015].

(a) A universal indicator is a mixture of several indicators. It shows different colour at different colour at different concentration of H+ ions concentration.

(b) Solution A is alkaline in nature. Solution B is acidic in nature. Solution A has a higher pH value.

(c) Salts of weak acid and strong base give a solution which has pH less than 7. Sodium acetate is an example of such salts. Salts of strong acid and weak base give a solution which has pH less than 7. Ammonium chloride is an example of such salt.

What is water of crystallization? Write the common name and the chemical formula of commercially important compound which has ten water molecules as water crystallization. How is this compound obtaining? Write the chemical equation also: List any two uses of this compound. [CBSE 2012]

Water of crystallization is the fixed number of water molecules present in one formula unit of the compound. The compound having ten water molecules as water of crystallization in Na₂CO₃.10H₂O. obtained. 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂ Na₂CO₃ + 10H₂O → Na₂CO₃.10H₂O

Uses of Washing soda: (i) It is used in removing permanent hardness of water. (ii) It is used in this manufacture of glass, soap and paper.

(a) Three acidic solution A, B and C have pH = 0,3 and 5 respectively. (i) Which solution has concentration of H+ ions? (ii) Which solution has highest concentration of H+ ions? (b) How concentrated sulphuric acids can be diluted? Describe the process [CBSE 2016]

(a) Smaller the pH value, higher the concentration of H+ ions (i) Solution A has the higher concentration of H+ ions. (ii) Solution C has the lower concentration of H+ ions.

(b) Take the water in the beaker. Add to it small amount of concentrated sulphuric acid with shaking with the help of a glass stirrer. Cool the beaker in water taken in the trough if it became hot. Continue adding sulphuric acid in a similar manner till the whole of sulphuric acid became diluted.

The pH of a salt used to make tasty and crispy pakora is 14. Identify the salt and write a chemical equation for its formation. List its two uses. [CBSE 2018]

The salt is baking soda (sodium hydrogen carbonate. NaCl + H₂O + CO₂ + NH₃ → NH₄Cl + NaHCO₃ Uses: (i) It is used in soda acid fire extinguisher. (ii) It is an ingredient of antacid. It neutralize excess acid in the stomach and provide relief.

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Assignments Class 10 Science Pdf Download

Students can refer to Assignments for Class 10 Science available for download in Pdf. We have given below links to subject-wise free printable Assignments for Science Class 10 which you can download easily. All assignments have a collection of questions and answers designed for all topics given in your latest NCERT Books for Class 10 Science for the current academic session. All Assignments for Science Grade 10 have been designed by expert faculty members and have been designed based on the type of questions asked in standard 10 class tests and exams. All Free printable Assignments for NCERT CBSE Class 10, practice worksheets, and question banks have been designed to help you understand all concepts properly. Practicing questions given in CBSE NCERT printable assignments for Class 10 with solutions and answers will help you to further improve your understanding. Our faculty have used the latest syllabus for Class 10. You can click on the links below to download all Pdf assignments for class 10 for free. You can get the best collection of Kendriya Vidyalaya Class 10 Science assignments and questions workbooks below.

Class 10 Science Assignments Pdf Download

CBSE NCERT KVS Assignments for Science Class 10 have been provided below covering all chapters given in your CBSE NCERT books. We have provided below a good collection of assignments in Pdf for Science standard 10th covering Class 10 questions and answers for Science. These practice test papers and workbooks with question banks for Class 10 Science Pdf Download and free CBSE Assignments for Class 10 are really beneficial for you and will support in preparing for class tests and exams. Standard 10th students can download in Pdf by clicking on the links below.

Subjectwise Assignments for Class 10 Science

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• The best collection of Grade 10 assignments for Science have been provided below which will help you in getting better marks in class tests and exams.
• The solved question for Class 10 Science will help you to gain more confidence to attempt all types of problems in exams
• Latest NCERT Books for Class 10 Science have been referred to for designing these assignments
• We have provided step by step solutions for all questions in the Class 10 assignments so that you can understand the solutions in detail.
• We have provided single click download links to all chapterwise worksheets and assignments in Pdf.
• Class 10 practice question banks will support to enhance subject knowledge and therefore help to get better marks in exam

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We provide here Standard 10 subject-wise assignments which can be easily downloaded in Pdf format for free. Our teachers have provided these Grade 10 Science test sheets for Science given in your books.

You can click on the links above and get assignments for Science in Grade 10, all chapters and topic-wise question banks with solutions have been provided here. You can click on the links to download in Pdf.

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If you are searching for class 10th science chapter wise assignments pdfs then you are at right place. In this post we have uploaded class 10 science assignments in pdf form which you can download easily in free of cost. We provide most unique class 10 science printable assignments as per NCERT latest syllabus. All worksheets have been made carefully for all type of students, you can download these science assignments pdf in free of cost and can practice all these questions and boost your preparations and get better marks in your exams. first read the chapter from NCERT book and class 10 handwritten notes pdf then do the basic questions of NCERT book and also do the questions of reference book if you have any then only start solving these assignments. This will help you understand the chapters in more details and after solving all the class 10 science assignments pdfs you will be confident in your exam. solve one assignment in at most 1 week to boost your preparation and get better marks.

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This free printable assignments for CBSE Class 10 Science with important chapter-wise questions are made by CBSE expert teacher having many years of experience in CBSE, students must practice NCERT Class 10 Science assignments on CBSE syllabus and books issued by NCERT. These class 10 science assignments pdf are made as per the latest NCERT book syllabus each important topics of your syllabus is covered very well. All type of possible questions are added in the assignments so that you can revise the topics if you forget that in any case, we use many reference books and coaching materials to made these science assignments.

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Activity 2.10 NCERT Class 10 Science, Acids, Bases and Salts

Activity 2.10 NCERT Class 10 Science, Chapter 2 Acids, Bases, and Salts

Activity 2.10 asks us to add a few drops of concentrated sulphuric acid slowly into a beaker containing water and see if heat produces.

Observation:

When we touch the bottom of the beaker, it feels hot

Explanation: 

Diluting an acid or base into water is an exothermic reaction. Here hydrogen ion interacts with a water molecule and forms hydronium ion. In this process, heat evolves which make the beaker hot.

H 2 SO 4 ——> H + + HSO 4 –

H + + H 2 O ——> H 3 O +

• We add acid to water. If we add water to acid, the high concentration of acid may produce a violent exothermic reaction.
• Concentrated acids and bases are corrosive; no person should touch it with bare hand or skin. In case a few drops spill on the body, a person should wash it with plenty of water.

Next: PH of common substances, Activity2.11.

See also: Concentrated acids do not turn litmus paper into red, activity 2.9.

Ref: Hydronium ion.

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• CBSE Class 10

CBSE Class 10 Science Practicals

CBSE Class 10 Science Practicals play an important role in developing students’ knowledge. All the discoveries and inventions done by scientists have been possible through experiments performed in the laboratory. Thus, lab work is crucial for making the learning complete, especially for a subject like Science. The CBSE Board included the Class 10 Science practicals in secondary classes intending to make students acquainted with the basic tools and techniques used in the laboratory. With the help of this, they can successfully perform the experiments listed in the CBSE Practicals of Class 10 Science.

By performing the experiments of CBSE Class 10 Science, students will understand concepts in a better way as they can now see the changes happening in front of their eyes. Their basics will become stronger as they will learn by doing experiments. Not only this, but their interest in Science subjects will also get generated. Students will develop questioning skills and start thinking from a scientific perspective. Here, we have provided all the necessary details that a Class 10 student should know about CBSE Class 10 Science practicals. From CBSE Science practical to lab manual, project work, NCERT lab kit manual and important questions, all the information is provided in the elaborated form further on this page for Class 10 students.

CBSE Class 10 Biology Practicals

• Experimentally Show That Carbon Dioxide Is Given out During Respiration
• Identification of the Different Parts of an Embryo of a Dicot Seed
• Preparing a Temporary Mount of a Leaf Peel to Show Stomata
• Studying Binary Fission in Amoeba and Budding in Yeast with the Help of Prepared Slides

CBSE Class 10 Chemistry Practicals

• Ph of Samples
• Properties of Acetic Acid Experiment
• Properties of Acids and Base
• Reactivity Series Experiment
• Study the Comparative Cleaning Capacity of a Sample of Soap in Soft and Hard Water
• Types of Reactions Experiment

Also Check: CBSE Class 10 Chemistry Viva Questions

CBSE Class 10 Physics Practicals

• Dependence of Potential Difference Across a Resistor on Current with Graph
• Determination of Focal Length of Concave Mirror and Convex Lens
• To Determine the Equivalent Resistance of Resistors When Connected in Series and in Parallel
• To Find Image Distance for Varying Object Distances of a Convex Lens with Ray Diagrams
• Tracing Path of a Ray of Light Passing Through a Glass Slab
• Tracing the Path of the Rays of Light Through a Glass Prism

All about CBSE Class 10 Science Practicals

In the Class 10 board exam, Science practicals also carry marks. The Class 10 Science theory paper is for 80 marks, and 20 marks are allocated to internal assessment. The marking scheme for internal evaluation is shown below:

CBSE Class 10 Science Practical Syllabus

The practical should be conducted alongside the concept taught in the theory classes. In Class 10 Science, there are a total of 15 practicals in the syllabus. The list of these practicals is provided below.

List of Experiments for CBSE Class 10 Science Practicals

1. A. Finding the pH of the following samples by using pH paper/universal indicator: (not included for this academic year) 

(i) Dilute hydrochloric acid

(ii) Dilute NaOH solution

(iii) Dilute ethanoic acid solution

(iv) Lemon juice

(vi) Dilute hydrogen carbonate solution

B. Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with:

a) Litmus solution (Blue/red)

b) Zinc metal

c) Solid sodium carbonate

2. Performing and observing the following reactions and classify them into:

A. Combination reaction

B. Decomposition reaction

C. Displacement reaction

D. Double displacement reaction

(i) Action of water on quicklime

(ii) Action of heat on ferrous sulphate crystals

(iii) Iron nails kept in copper sulphate solution

(iv) Reaction between sodium sulphate and barium chloride solutions

3. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions:

i) ZnSO 4 (aq)

ii) FeSO 4 (aq)

iii) CuSO 4 (aq)

iv) Al 2 (SO4) 3 (aq)

Arranging Zn, Fe, Cu and Al (metals) in decreasing order of reactivity based on the above result.

4. Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determining its resistance. Also, plotting a graph between V and I.

5. Determination of the equivalent resistance of two resistors when connected in series and parallel.

6. Preparing a temporary mount of a leaf peel to show stomata.

7. Experimentally show that carbon dioxide is given out during respiration.

8. Study of the following properties of acetic acid (ethanoic acid):

ii) Solubility in water

iii) Effect on litmus

iv) Reaction with sodium hydrogen carbonate

9. Study of the comparative cleaning capacity of a sample of soap in soft and hard water.

10. Determination of the focal length of:

i) Concave mirror

ii) Convex lens

by obtaining the image of a distant object

11. Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, and angle of emergence and interpret the result.

12. Studying (a) binary fission in Amoeba and (b) budding in yeast and Hydra with the help of prepared slides.

13. Tracing the path of the rays of light through a glass prism.

14. Identification of the different parts of an embryo of a dicot seed (Peas, gram or red kidney bean).

CBSE Class 10 Science Lab Manual

For carrying out experiments in the laboratory, students need to know the proper use of the instruments. This CBSE Class 10 Science lab manual familiarises students with the available instruments in the laboratory and informs them about the dos and don’ts while performing experiments. Teachers also explain to students all these things at the beginning of the session.

Each experiment in the CBSE Class 10 Science lab manual is described based on the following points:

• Aim: It explains the objective of the experiment.
• Theory: It explains the basic principles, laws or theories on which the experiment is based.
• Material required: Under this head, all the equipment, measuring devices and other material that is necessary to conduct the experiment are enlisted.
• Procedure: Under this heading, the steps to perform the experiment are mentioned in a proper sequence. Also, diagrams are drawn wherever required to present the pictorial view of the experiment.
• Observation: All the observations are noted down while performing the experiments. For a better presentation, observations are noted in the form of a table. Proper units are expressed for each measurement.
• Calculations: Calculations are based on observation using formulae. In some experiments, graphs are also drawn.
• Results and Discussion: The final result of the experiment is mentioned under this heading.
• Precautions and Sources of Errors: All the precautions that are observed while conducting the experiments are mentioned here. Also, the sources of error which arise due to the limitation of equipment are stated under this heading.

Download CBSE Class 10 Science Laboratory Manual

Students can download the complete lab manual from the table below. The CBSE Class 10 lab manual is divided into 5 parts. The last part consists of project work in which a total of 111 projects are suggested. These projects will promote creativity and a spirit of inquiry in students. Also, it will help them understand the application of the Science subject. Moreover, each project is explained clearly so that students can perform them easily.

CBSE Class 10 Science Practical Important Questions

At the end of each experiment, a few questions are provided in the lab manual. These questions are given to test how much students have learnt from a particular experiment. So, students must answer all these questions. Below provided are a few of these questions. However, students will get the complete set of questions in the CBSE Class 10 lab manual PDF provided above.

Q1) What is your observation when copper is added to iron (II) sulphate solution?

Q2) Why is sulphur dioxide collected by upward displacement of air?

Q3) How does the carbon dioxide gas enter the leaves?

Q4) Which by-product of fermentation is useful in the brewing industry?

Q5) Why are the incident and emergent rays parallel to each other in the case of a rectangular glass slab?

Q6) On what factors does the refractive index of a medium depend?

Q7) Why is it advised to clean the ends of connecting wires before connecting them?

Q8) How are the magnetic field lines of a straight current-carrying wire different from the field lines of a bar magnet?

NCERT Class 10 Science Manual Kit

The NCERT Class 10 Science manual kit provides activities on various chapters of Science subjects. The kit contains scientific and general items, chemicals, glassware, tools, etc. All the details of these tools and the methods of using them are described in the NCERT Class 10 Science Manual Kit. Various discoveries and inventions happened because of performing these experiments. Students will understand the concepts and synthesise their knowledge by doing these experiments. They can also connect the topic with the theory part that they have studied and discussed in the classroom. They will inculcate problem-solving strategies and group learning skills in themselves while performing the activities through kits. It also creates interest and motivates them to learn new facts.

To download the NCERT Manual of Class 10 Science kit in PDF, click on the link below:

Download NCERT Class 10 Science Manual Kit

Each activity in the NCERT Class 10 Science manual kit is explained in detail and covers the following points:

• What are the materials required to perform the activity?
• The process of performing the activity is mentioned in the steps.
• The final result that students have obtained by performing the activity.

We hope students have found this article on “CBSE Class 10 Science Practicals” useful in their studies. Keep learning and stay tuned to BYJU’S for further updates on CBSE and other competitive exams. Download the BYJU’S – The Learning App and subscribe to the YouTube channel to access interactive Maths and Science videos.

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Maharashtra State Board Class 10 Science Solutions Part 1 & 2

Maharashtra state board 10th std science textbook solutions part 1 & 2.

Solution of 10th Class Science Maharashtra Board

Maharashtra State Board Class 10 Science Solutions Part 1

Solution of 10th Class Science 1 Maharashtra Board

• Chapter 1 Gravitation
• Chapter 2 Periodic Classification of Element
• Chapter 3 Chemical reactions and equations
• Chapter 4 Effects of electric current
• Chapter 5 Heat
• Chapter 6 Refraction of light
• Chapter 7 Lenses
• Chapter 8 Metallurgy
• Chapter 9 Carbon Compounds
• Chapter 10 Space Missions

Maharashtra State Board Class 10 Science Solutions Part 2

Solution of 10th Class Science 2 Maharashtra Board

• Chapter 1 Heredity and Evolution
• Chapter 2 Life Processes in Living Organisms Part – 1
• Chapter 3 Life Processes in Living Organisms Part – 2
• Chapter 4 Environmental management
• Chapter 5 Towards Green Energy
• Chapter 6 Animal Classification
• Chapter 7 Introduction to Microbiology
• Chapter 8 Cell Biology and Biotechnology
• Chapter 9 Social health
• Chapter 10 Disaster Management

Maharashtra State Board Class 10 Textbook Solutions

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