When `SO_(2)` is passed through acidified solution of potassium dichromate, then chromium sulphate is formed the change in valence of chromium is

Options

A. `+4` to +2
B. `+5` to +3
C. `+6` to +3
D. `+7` to +2

Answer

C

Explanation

`K_(2)Cr_(2)O_(7)+3SO_(2)+4H_(2)SO_(4) to K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+3SO_(3)+4H_(2)O`
O.N. of chromium changes from +6 to +3.