NCERT Chemistry Class 12 Electrochemistry - Chapter 3 Quiz 1

1. The charge required for the reduction of 1 mol of MnO₄⁻ to MnO₂ is:

1 F

3 F

3 F

6 F

2. Which of the following reaction is used to make a fuel cell?

Oxidation reaction

Reduction reaction

Disproportionation reaction

Decomposition reaction

3. NH₄NO₃ is used in a salt bridge because:

It forms a jelly-like material with agar-agar

It is a weak electrolyte

It is a good conductor of electricity

The transport number of NH₄⁺ and NO₃⁻ ions are almost equal

4. The reaction (3ClO⁻ → ClO₃ + 2Cl⁻) is an example of:

Oxidation reaction

Reduction reaction

Disproportionation reaction

Decomposition reaction

5. The emf of the cell: Ni/Ni²⁺ (1.0 M) // Au³⁺ (1.0 M) / Au (E° = -0.25 V for Ni²⁺/Ni; E° = 1.5 V for Au³⁺/Au) is:

1.25 V

-1.25 V

1.75 V

2.0 V

6. The standard emf of a galvanic cell involving a cell reaction with (n = 2) is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be:

(1.0 \times 10^{10})

(2.0 \times 10^{11})

(4.0 \times 10^{12})

(1.0 \times 10^2) (Given: (F = 96500 , \text{mol}^{-1}); (R = 8.314 , \text{J K}^{-1} , \text{mol}^{-1}))

7. Galvanized iron sheets are coated with:

Carbon

Copper

Zinc

Nickel

8. Standard solution of KNO₃ is used to make a salt bridge because:

Velocity of K⁺ is greater than that of NO₃⁻

Velocity of NO₃⁻ is greater than that of K⁺.

Velocity of both K⁺ and NO₃⁻ are nearly the same.

KNO₃ is highly soluble in water

9. How many coulombs are required for the oxidation of 1 mole of H₂O to O₂?

1.93 × 10⁵ C

9.65 × 10⁴ C

3.86 × 10⁵ C

4.825 × 10⁵ C

10. Rust is a mixture of

FeO and Fe(OH)₃

FeO and Fe(OH)₂

Fe₂O₃ and Fe(OH)₃

Fe₃O₄ and Fe(OH)₃

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