What happen when a solution of potassium chromate is treated with an excess of dil. Nitic acid?
A. `Cr^(3+)` and `Cr_(2)O_(7)^(2-)` are formed
B. `Cr_(2)O_(7)^(2-)` and `H_(2)O` are formed
C. `Cr_(2)O_(7)^(2-)`is reduced to `+3` state pf `Cr`
D. `Cr_(2)O_(7)^(2-)` is oxidised to `+7` state of `Cr`