Question

Two electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride, are connected in series. The ratio of iron deposited at cathodes in the two cells will be :
(a) 3 : 1
(b) 2 : 1
(c) 1 : 1
(d) 3 : 2

Answer 1

At cathode-

Fe 2+ + 2e- --------> Fe

Fe 3+ + 3e- ---------> Fe

E(Fe)1 = atomic weight/2

E(Fe)2 = atomic weight/3

Hence

Ratio of weight of Fe liberated = 3:2