The quantity of electricity required to reduce 12.3 g of nitrobenzene to aniline with 50 % current efficiency is:

1. 1 F

2. 0.6 F

3. 0.5 F

4. 1.2 F

When aqueous NaCl solution is electrolysed using inert electrodes then pH of the solution:

1. Increases.

2. Decreases.

3. Remains same.

4. First increases then decreases.

Find the maximum electrical work obtainable from the Daniell cell:

Zn(s) | Zn²⁺(aq) || Cu²⁺(aq) | Cu(s)

Given:

E°(Zn²⁺/Zn) = −0.76 V
E°(Cu²⁺/Cu) = +0.34 V

1. +106.15 kJ

2. -212.3 kJ

3. -424.6 kJ

4. +212.3 kJ

Calculate the EMF of the following concentration cell at 298 K:

Pt | H₂(1 atm) | H⁺(0.02 M) || H⁺(0.01 M) | H₂(1 atm) | Pt

1. - 0.017 V

2. 0.0295 V

3. 0.10 V

4. 0.059 V

By how much will the electrode potential of the Cu²⁺/Cu half-cell change when the concentration of Cu²⁺ ions is reduced to one-hundredth of its initial value at 298 K?

Find the relationship between E₁ and E₂ for the following Daniell cell:

Zn | ZnSO₄ (0.01 M) || CuSO₄ (1.0 M) | Cu

The emf of this cell is E₁.

If the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO₄ is changed to 0.01 M, the emf becomes E₂.

Given:

RT/F = 0.059 V

1. E₁ = E₂

2. E₁ > E₂

3. E₁ < E₂

4. E₂ = 0 \(\neq\)E₁

The weight of silver (atomic weight = 108) displaced by a quantity of electricity which displaces 5600 mL of O₂ at STP will be : 

1. 5.4 g

2. 10.8 g

3. 54.0 g

4. 108.0 g

Given the reaction:

\(\mathrm{Cu}(\mathrm{~s})+2 \mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{~s})\) with E° = 0.46 V at 298 K,
what is the equilibrium constant for the reaction?

During electrolysis of conc. H₂SO₄, perdisulphuric acid (H₂S₂O₈), and O₂
form in equimolar amount. The amount of H₂ that will form simultaneously will be : 

1. Thrice that of O₂ in moles.

2. Twice that of O₂ in moles.

3. Equal to that of O₂ in moles.

4. Half of that of O₂ in moles.

What happens to the voltage in a galvanic cell when the salt bridge is removed?

1. The voltage drops to zero.
2. The voltage remains the same.
3. The voltage gradually increases.
4. The voltage rapidly increases.