Which reaction is possible at anode?

Options

A. `2Cr^(3+)+7H_(2)OtoCr_(2)O_(7)^(2-)+14H^(+)`
B. `F_(2)to2F^(-)`
C. `(1)/(2)O_(2)+2H^(+)toH_(2)O`
D. displacement reaction

Answer

A

Explanation

Here `Cr^(3+)` is oxidised to `C_(2)O_(7)^(2-)`