Chemistry

 

Test Paper 1 

Chapter 1: Chemical Reactions and Equations

Time: 1.5 Hours
Maximum Marks: 30

Section A (1 × 8 = 8 marks)

(Very Short Answer Questions)
Attempt all questions.

  1. What is a chemical reaction?
  2. Write any one observable sign of a chemical reaction.
  3. What is meant by a balanced chemical equation?
  4. Define combination reaction with one example.
  5. What type of reaction is represented by:
    CaCO₃ → CaO + CO₂
  6. What is corrosion? Give one example.
  7. Write the chemical formula of rust.
  8. What is rancidity?

Section B (2 × 6 = 12 marks)

(Short Answer Questions)
Attempt all questions.

  1. Balance the following chemical equation:
    Fe + H₂O → Fe₃O₄ + H₂
  2. Write the steps involved in balancing a chemical equation.
  3. Identify the type of reaction and justify:
    Zn + CuSO₄ → ZnSO₄ + Cu
  4. What happens when:
    a) Magnesium ribbon is burnt in air?
    b) Iron nails are dipped in copper sulphate solution?
  5. Differentiate between exothermic and endothermic reactions with examples.
  6. Why should a magnesium ribbon be cleaned before burning in air?

Section C (4 × 2 = 8 marks)

(Long Answer Questions)
Attempt any TWO.

  1. a) Write a balanced chemical equation for the reaction between sodium and water.
    b) Name the type of reaction.
    c) State whether it is exothermic or endothermic.

OR

  1. a) What is an oxidation reaction?
    b) What is a reduction reaction?
    c) Identify oxidising and reducing agents in the reaction:
    CuO + H₂ → Cu + H₂O
  1. a) Explain decomposition reaction with example.
    b) Write the electrolytic decomposition of water with balanced equation.

OR

  1. a) Explain displacement reaction with example.
    b) Why is it called displacement reaction?

Section D (Case-Based Question) (1 × 2 = 2 marks)

A student performed an experiment where lead nitrate solution was mixed with potassium iodide solution. A yellow precipitate was formed.
           a) Write the balanced chemical equaiton.
           b) Identify the type of reaction. 

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