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Federal (FBISE) · Chapter test · Free

9th Class Chemistry Chapter 7 Test07. Electrochemistry

30 marks · 40 minutes · 21 questions. Covers: 07. Electrochemistry.

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9th Class Chemistry Chapter 7 Test

9th Class · Chemistry · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. Oxidation involves:
    1. loss of electrons
    2. gain of electron
    3. gain of hydrogen
    4. none of these
  2. Oxidation is shown by:
    1. metals
    2. non-metals
    3. both a and b
    4. none of these
  3. Silver tarnish in the presence of:
    1. SO₂
    2. H₂S
    3. Both a and b
    4. None of these
  4. Stainless steel is an alloy of :
    1. Iron
    2. Chromium
    3. Nickel
    4. All of these
  5. Reduction involves:
    1. loss electrons
    2. gain electrons
    3. loss of hydrogen
    4. none of these
  6. In which of the following changes, the nitrogen atom is reduced.
    1. N₂ to NO
    2. N₂ to NO₂
    3. N₂ to NH₃
    4. N₂ to HNO₃
  7. Which act as anode in cathodic protection method?
    1. Mg
    2. Al
    3. Both a and b
    4. None of these
  8. By painting the metal __________ cannot touch the metal surface.
    1. oxygen
    2. moisture
    3. both a and b
    4. none of them
  9. During galvanizing iron sheet is dipped into:
    1. Sn
    2. Zn
    3. SnCl₂
    4. ZnCl₂
  10. Consider the reaction: H₂S + Cl₂ → 2HCl + S. In this reaction H₂S behaves as:
    1. Reducing agent
    2. Oxidizing agent
    3. Catalyst
    4. Electrolyte

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Explain one example from daily life which involves oxidation-reduction reaction?
  2. What is oxidation state?
  3. Which is true about the equilibrium state?
    1. The forward reaction stops.
    2. The reverse reaction stops.
    3. Both forward and reverse reaction stop.
    4. Both forward and reverse reaction continue at the same rate.
  4. When a mixture of H₂(g) and I₂(g) is sealed in a flask and temperature is kept at 25°C, equilibrium is established: H₂(g) + I₂(g) ⇌ 2HI(g). Which substance(s) will be present in the equilibrium mixture?
    1. H₂ and I₂
    2. HI only
    3. H₂ only
    4. H₂, I₂ and HI
  5. What is the oxidation number of Cr in chromic acid (H₂CrO₄)?
  6. Concentration of reactants and products at equilibrium remains unchanged if:
    1. concentration of any reactant or product is not changed
    2. temperature of the reaction is not changed.
    3. pressure or volume of the system is not changed.
    4. all of the above are observed.
  7. Which of the following is a Bronsted base?
    1. NH₃
    2. HCl
    3. CH₃COOH
    4. H₃O⁺
  8. Which of the following cannot be classified as Arrhenius acid?
    1. HNO₃
    2. H₂CO₃
    3. CO₂
    4. H₂SO₄

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Give methods for corrosion prevention.
  2. (a) Define oxidation number or oxidation state. (b) Find the oxidation state of nitrogen in the following compounds. (i) NO₂ (ii) N₂O (iii) N₂O₃ (iv) HNO₃
  3. (a) Define oxidizing and reducing agents. (b) Identify the oxidizing agents and reducing agents in the following reactions: (i) H₂S + Cl₂ → 2HCl + S (ii) 2 FeCl₂ + Cl₂ → 2 FeCl₃ (iii) 2 KI + Cl₂ → 2KCl +I₂ (iv) Mg + 2 HCl → MgCl₂ + H₂