The standard potentials at 25°C for the half reactions are given against them below.

Zn²⁺+ 2e^– → Zn; E° = –0.762 V

Mg²⁺+ 2e^– →Mg E° = –2.37 V

On the basis of information available for the reaction:

$\dfrac{4}{3}$Al + O₂ → 2Al₂O₃; ΔG = –827 kJ mol^–1 of O₂.

The minimum e.m.f. required to carry out the electrolysis of Al₂O₃ is (F = 96500 C mol^–1)

The standard reduction potential for Cu²⁺/Cu; Zn²⁺/Zn; Li⁺/Li; Ag⁺/Ag and H⁺/H₂ are 0.34 V, –0.762 V, –3.05 V, + 0.80 V and 0.00 V respectively. Choose the strongest reducing agent among the following.

The standard reduction potentials of Ag, Cu, Co and Zn are 0.799, 0.337, –0.277 and –0.762 V respectively. Which of the following cells will have maximum cell e.m.f.?

The Eo
M³⁺/m²⁺values of Cr, Mn, Fe and Co are –0.41, + 1.57, +0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?

The oxidation state of chromium in the final product formed by the reaction between Kl and acidified potassium dichromate solution is

Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.3 S m^–1. If resistance of the 0.4 M solution of the same electrolyte is 260 Ω, its molar conductivity is

E₁, E₂ and E₃ are the emf values of the three galvanic cells respectively.

(a) Zn | Zn+2
1 M || Cu+2
0.1 M | Cu

(b) Zn | Zn+2
1 M || Cu+2
1 M | Cu

(c) Zn | Zn+2
0.1 M || Cu+2
1 M | Cu

Which one of the following is true?

Which among the following metals is employed to provide cathodic protection to iron?

The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mhos cm² and at infinite dilution is 400 mhos cm². The dissociation constant of this acid is