Question

Answer the following questions:-
Q.1 Write equations for the reactions taking place at the cathode and anode during the
electrolysis of
(i) Acidified sodium argentocyanide solution with silver anode.
(ii) Molten lead bromide with inert electrodes.​

Answer 1

Answer:

(i) At the anode oxidation reaction takes place.

At anode : Cu−2e

−

→Cu

2+

At cathode redution reaction occurs.

At cathode : Cu

2+

+2e

−

→Cu

Here both copper electrodes are used.

(ii) At anode : Br

−

−e

−

→Br

Br+Br→Br

2

At cathode : Pb

2+

+2e

−

→Pb

Here both anode and cathode are made up of graphite as it is unaffected by bromine vapours.