A solution containing one mole per litre each of `AX, BX_(2), CX_(2)` and `DX_(2)` is electrolysed using inert electrodes. The values of the standard potentials for reduction reactions of `A^(+)|A, B^(2+)|B,C^(2+)|C` and `D^(2+)|D` are `+.80, +.34, -0.76` and `-1.66` volts respectively. The correct sequence in which these metals will be deposited on the cathode is :

Options

A. `A, B, C, D`
B. `D, C, B, A`
C. `A, C, B, D`
D. `D, B, C, A`

Answer

A

Explanation

The metal ion which is discharged first has higher reduction potential i.e. , `A gt B gt C gt D`