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_(2)^(6+)+6e^(-)to2Cr^(3+)]xx1,[Sn^(2+)toSn^(4+)+2e^(-)]xx3`