Give reason for the following:

Electrolysis of molten lead bromide is considered to be a redox reaction.

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.

A soln. contains Mg²⁺ ions, Fe²⁺ ions and Cu²⁺ ions. On passing an electric current through this soln. which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.

During electroplating of an article with nickel —

(i) Name — (a) The electrolyte (b) The cathode (c) The anode

(ii) Give the reaction of the electrolysis at (a) The cathode (b) The anode