CBSE - Electrochemistry

The charge required for the reduction of 1 mol of MnO₄^– to MnO₂ is

• 1 F

• 3 F

• 6 F

• 4 F

If limiting molar conductivity of Ca²⁺ and Cl^– are 119.0 and 76.3 S cm² mol^-1, then the value of limiting molar conductivity of CaCl2 will be

• 195.3 S cm² mol^-1

• 271.6 S cm² mol^-1

• 43.3 S cm² mol^-1

• 314.3 S cm² mol^-1.

If E°_Fe²⁺/Fe = -0.441 V and E°_{Fe²⁺/Fe²⁺} = 0.771 V, the standard EMF of the reaction,
Fe + 2Fe³⁺ → 3Fe²⁺ will be

• 1.212 V

• 0.111 V

• 0.330 V

• 1.653 V

The reaction, 3ClO^– (aq) → ClO₃ (aq) + 2Cl^– (aq) is an example of

• Oxidation reaction

• Reduction reaction

• Disproportionation reaction

• Decomposition reaction

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

• Velocity of K+ is greater than that of NO−3.

• Velocity of NO−3 is greater than that of K⁺

• Velocity of both K⁺ and NO−3 are nearly same

• KNO₃ is highly soluble in water.

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

The standard reduction potentials of Cu²⁺/Cu and Cu²⁺/Cu⁺ are 0.337 and 0.153 respectively. The standard electrode potential of Cu⁺/Cu half cell is

• 0.184 V

• 0.521 V

• 0.693 V

• 1.23 V

The standard reduction potentials of X, Y, Z metals are 0.52, -3.03, -1.18 respectively. The order of reducing power of the corresponding metals is:

• Y > Z > X

• X > Y > Z

• Z > Y > X

• Z > X > Y

The amount of electricity required to deposit 1 mol of aluminium from a solution of AlCl₃ will be

• 0.33 F

• 1.2 f

• 2 F

• 3 F

For a cell reaction involving two electron change the standard emf of the cell is found to be 0.295 V at 25°C. The equilibrium constant for the reaction at 25°C will be:

• 2.95 × 10²

• 10

• 1 × 10¹⁰

• 2 × 10¹⁰