What is the current efficiency of an electrode deposition of Cu metal from CuSO₄ solution in which 9.8 gm copper is deposited by the passage of 5 amperes current for 2 hours?

1. 41.4 %

2. 50%

3. 75%

4. 82.8 %

1. 0.02

2. 0.01

3. 200

4. 0.037

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 molar conductivity of a solution of AgNO₃ (considering the given data for this solution) at 298 K is:
(a) Concentration: 0.5 mol/dm³
(b) Electrolytic conductivity: 5.76×10^–3 S cm^–1

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is

(1) 55 minutes                       

(2) 110 minutes

(3) 220 minutes                       

(4) 330 minutes

If the E°_cell for a given reaction has a negative value, which of the following gives correct relationships for the values of $∆$G° and K_eq ?

(1) $∆$G° >0;  K_eq< 1

(2) $∆$G° >0; K_eq>1

(3) $∆$G° < 0; K_eq> 1

(4) $∆$G° <0; K_eq< 1

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 x 10^-19 C)

1. 6 x 10²³

2. 6 x 10²⁰

3. 3.75 x 10²⁰

4. 7.48 x 10²³

Zinc can be coated on iron to produce galvanised iron but the reverse is not possible. It is because

(1) zinc is lighter than iron

(2) zinc has lower melting point than iron

(3) zinc has lower negative electrode potential than iron

(4) zinc has higher negative electrode potential than iron

The pressure of H₂ required to make the potential of H₂-electrode zero in pure water at

298 K is

1. 10^-12 atm

2. 10^-10 atm

3. 10^-4 atm

4. 10^-14 atm

A device that converts energy of the combustion of fuels like hydrogen and methane, directly

into electrical energy is known as:

1. Fuel cell

2. Electrolytic cell

3. Dynamo

4. Ni-Cd cell