The quantity of electricity needed to electrolyse completely `1M` solution of `CuSO_4, Bi_2 (SO_4)_3, AICI_3` and `AgNO_3` each will be .

Options

A. `2 : 3 : 1`
B. `2 : 1 : 1`
C. `2 : 1 : 3`
D. `2 : 2 : 1`

Answer

A

Explanation

`Zn^(2+) (1M) + 2e^- to Zn` charge required = 2 F
`Al^(3+) (1 M) + 3e^(-) to Al` charge required = 3 F
`Ag^(+) (1 M) + e^(-) to Ag` charge required = 1 F
Therefore , charge required for `ZnSO_(4) , AlCl_(3)` and `AgNO_(3)` solutions is `2 F` , 3 F and 1 F respectively .
Thus , the ratio is `2 : 3 : 1`