The standard electrode potentials for three half-cells are given below.

X²⁺ / X ; E^ө = – 0.44 V

Y²⁺ / Y ; E^ө = – 0.76 V

Z²⁺ / Z ; E^ө = +0.34 V

Which of the following can reduce Sn²⁺ (aq) to Sn (s) at 298K?

(The standard electrode potential for Sn²⁺ (aq) / Sn (s) at 298 K is 0.14 V)

The standard electrode potentials for some half-cell reactions are given below

Half-cell reaction Eө / V

½ Br₂ + e --> Br ^– + 1.07

Fe³⁺ + e --> Fe²⁺ + 0.77

½ I₂ + e --> I ^– + 0.54

Which pairs of species can react with each other based on the above data?

After a steady current of 18.0 A was passed for 20.0 minutes through a solution of copper(II) sulphate, the mass of the impure copper anode decreased by 8.01 g. What is the percentage purity of copper in the impure copper rod? [Ar Cu = 63.5 ; Faraday’s constant = 96500 C mol^-1]

Which of the following is true about the Danielle cell?

Mg²⁺ + 2e --> Mg; E = - 2.38V

Fe³⁺ + e --> Fe²⁺; E = +0.77V

Calculate the e.m.f. of the following cell:

Mg l Mg²⁺ (10M) ll Fe³⁺ (5M) l Fe²⁺(1m) l Pt

During electrolysis of a copper(II) salt solution between copper electrodes, the mass of copper electroplated on the cathode depends on

In which of the following pairs of spesies is the sulphur in the same oxidation state in both members of the pairs?

The e.m.f. of the cell Pt(s) |H₂(g)|H⁺(aq)||Ag⁺(aq)|Ag(s) would be increased by