Question

CHAPTEER 1. CHEMICAL REACTION AND EQUATION

ASSIGNMENT 1 page no.1

Q.1. When iron is heated with sulphur, iron sulphide is formed. What is the reaction called? (1 mark)

Q.2. When hydrogen is passed over heated CuO, brown copper is deposited. Which element is reduced? (1 mark)

Q.3. Aluminium metal displaces iron from ferric oxide (Fe2O3) giving aluminium oxide and iron.

Which is more reactive aluminium or iron? (1 mark)

Q.4. The taste and smell of food changes when kept for long time in open. What is it called? (1 mark)

Q.5. What is the general name of the chemicals which are added to fat and oil containing foods to

prevent the development of rancidity. (1 mark)

Q.6. When copper strip is placed in a solution of silver nitrate, copper nitrate and silver are formed. (1 mark)

Q.7. Give one example of a redox reaction which is also a combination reaction reaction. (1 mark)

Q.8. Name two anti-oxidants which are usually added to fat and oil containing foods to prevent rancidity. (1 mark)

Q.9. When SO2 gas is passed through saturated solution of H2S, the following reaction occurs:

SO2 + 2H2S → 2H2O + 3S

In this reaction, Which substance is oxidized and which one is reduced? (1 mark)

Q.10. When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and

Oxygen are produced. What type of reaction take place: (i) in first case (ii) in second case. (1 mark)

Q.11. Identify the substance oxidized and reduced in the chemical reaction :

MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O (1 mark)

Q.12. Balance the following equation and add the state symbols:

Zn + HCl → ZnCl2 + H2 (1 mark)

Q.13. Identify the compound oxidized, the compound reduced, the reducing agent and the oxidizing agent

In the following reactions:

i. H2S + Cl2 → 2HCl + S

ii. 4Na + H2 → 2Na2O

iii. ZnO + C → Zn + CO

iv. H2S + Cl2 → 2HCl + S

v. MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

vi. SO2 + 2H2S → 2H2O + 3S

vii. PbS + 4H2O2 → PbSO4 + 4H2O

viii. CuO + H2 → Cu + H2O

ix. Zn + CuSO4 → ZnSO4 + Cu

x. Fe2O3 + 2Al → Al2O3 + 2Fe

Q.14. Define chemical change.

Q.15. What do you mean by exothermic reaction? Give example​

Answer 1

Explanation:

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