10th Chemistry Unit Wise Question Paper with Important Reactions

Build a rock-solid foundation in science with our structured collection of 10th Chemistry Unit-Wise Question Papers. Chemistry is a subject where mastering individual concepts—like balancing chemical equations, understanding periodic trends, or identifying carbon compounds—is the key to overall success. This page offers targeted, chapter-by-chapter test papers designed to evaluate your understanding of each unit independently. Use these papers to pinpoint your weak spots, perfect your chemical formulas, and ensure no topic is left unprepared.

10th Science - (Chemistry)

Unit-Wise Question Papers

7. Atoms and Molecules

1. Define Relative atomic mass.

2. Define Atomicity.

3. Give any two examples for heterodiatomic molecules.

4. What is molar volume of a gas?

5. Find the percentage of nitrogen in ammonia.

6. Define isotopes.

7. Define isobars.

8. Calculate the number of water molecule present in one drop of water which weight 0.18g.

9. Calculate the number of moles in:
i) 27g of Al
ii) 1.51 × 10²³ molecules of NH₄Cl

10. Give the salient features of "Modern atomic theory".

11. Derive the relationship between relative molecular mass and vapour density.

12. Differentiate atoms and molecules.

13. State Avogadro's law.

14. Give the application of Avogadro's law.

8. Periodic Classification of Elements

1. A is reddish brown metal, which combines with O₂ at <1370k gives B, a black-coloured compound. At a temperature > 1370k, A give C which is red in colour. Find A, B and C with reaction.

2. A is a silvery white metal. A combine with O₂ to form B at 800°C, the alloy is used in making the aircraft. Find A and B.

3. What is rust? Give the equation for formation of rust.

4. State two conditions necessary for rusting of iron.

5. State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.

6. Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.

7. Explain smelting process.

8. The electronic configuration of metal A is 2, 8, 18, 1. The metal A when exposed to air and moisture forms B a green layered compound. A with con. H₂SO₄ forms C and D along with water. D is a gaseous compound. Find A, B, C, D.

9. Solutions

1. Define solution.

2. What is meant by binary solution?

3. What is aqueous and non-aqueous solution? Give an example.

4. Define volume percentage.

5. Define Hydrated salt.

6. The aquatic animals live more in cold region. Why?

7. A hot saturated solution of copper sulphate forms crystals as it cools. Why?

8. What is super saturated solution?

9. What is ternary solution?

10. What is concentration of a solution?

11. State Henry's law.

12. Classify the following substance into deliquescence or hygroscopic: Con. Sulphuric acid, Copper sulphate pentahydrate, silica gel, calcium chloride and gypsum salt.

13. Write notes on: 1. Saturated solution 2. Unsaturated solution

9. Solutions (Continued)

14. Write a note on various factors affecting solubility.

15. What happens when MgSO₄·7H₂O is heated? Write the appropriate equation.

16. Define solubility.

17. In what way hygroscopic substances differ from deliquescent substances.

18. A solution is prepared by dissolving 45g of sugar in 180g of water. Calculate the mass percentage of solute.

19. 3.5 litres of ethanol are present in 15 litres of aqueous solution of ethanol. Calculate volume percentage of ethanol solution.

10. Types of Chemical Reactions

1. When an aqueous solution of potassium chloride added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.

2. Why does the reaction rate of a reaction increase on raising the temperature?

3. Define combination reaction.

4. Give one example for an exothermic combination reaction.

5. Differentiate reversible and irreversible reactions.

6. What are called thermolysis reaction?

7. Explain the types of double displacement reaction with example.

8. Explain the factors influencing the rate of a reaction.

9. How does pH play an important role in everyday life?

10. What is a chemical equilibrium? What are its characteristics?

11. Carbon and its Compounds

1. Name the simplest ketone and its structural formula.

2. Classify the following compounds based on the pattern of carbon chain and give their structural formula: (Propane, Benzene, Cyclobutane, Furan)

3. How is ethanoic acid prepared from ethanol. Give the chemical equation.

4. How do detergents cause water pollution? Suggest remedial measures to prevent their pollution.

5. Differentiate soaps and detergents.

6. What is called homologous series? Give any three of its characteristics.

7. Arrive at systematically, the IUPAC name of the compound CH₃-CH₂-CH₂-OH.

8. How is ethanol manufactured from sugar cane.

9. Give the balanced chemical equation of the following reaction:
a) Neutralization of NaOH with ethanoic acid
b) Evolution of carbon dioxide by the action of ethanoic acid with NaHCO₃

10. Explain the mechanism of cleaning action of soap.