State the observations at the anode & at the cathode during the electrolysis of –

(i) Fused lead bromide using graphite electrodes.

(ii) Copper sulphate solution using copper electrodes.

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions listed below:

(i) SO₄^2-, NO₃^- and OH^- ;

(ii) Pb²⁺, Ag⁺ and Cu²⁺.

Give reasons why:

(i) Sodium Chloride will conduct electricity only in fused or aq. soln. state.

(ii) In the electroplating of an article with silver, the electrolyte sodium argentocyanide soln. is preferred over silver nitrate solution.

(iii) Although copper is a good conductor of electricity, it is a non-electrolyte.

Name:

(i) the product formed at the anode – during electrolysis of acidified water using platinum electrodes.

(ii) the metallic ions that should be present – in the electrolyte when an article made of copper is to be electroplated with silver.