When the ion `Cr_(2)O_(7)^(2-)` acts as an oxidant in acidic aqueous solution the ion `Cr^(3+)` is formed. How many mole of `Sn^(2+)` would be oxidised to `Sn^(4+)` by one mole `Cr_(2)O_(7)^(2-)` ion:

Options

A. `2//3`
B. `3//2`
C. `2`
D. `3`

Answer

D

Explanation

`[(Cr^(6+))_(2) + 6e rarr 2Cr^(2+)]xx1`
`[Sn^(2+) rarr Sn^(4+) + 2e] xx 3`