Question

Select the correct answer from the list in brackets:

1. An aqueous electrolyte consists of the ions. mentioned in the list, the ion which could be discharged most readily during electrolysis.

[Fe²⁺ , Cu²⁺ , Pb²⁺ , H⁺].

2. The metallic electrode which does not take part in an electrolytic reaction.

[Cu, Ag, Pt, Ni].

3. The ion which is discharged at the anode during the electrolysis of copper sulphate solutions using copper electrodes as anode and cathode.

[Cu²⁺ , OH^– , SO₄^2- -, H⁺].

4. When dilute sodium chloride is electrolysed using graphite electrodes, the cation is discharged at the cathode most readily.

[Na⁺ , OH^– , H⁺ , Cl^–].

5. During silver plating of an article using potassium argentocyanide as an electrolyte, the anode material should be 

[Cu, Ag, Pt, Fe].

Answer 1

(1) Cu²⁺

(2) Pt

(3) Cu²⁺

(4) H¹⁺

(5) Ag