What happen when a solution of potassium chromate is treated with an excess of dil. Nitic acid?
A. `Cr_(2)O_(7)^(2-)` and `H_(2)O` are formed
B. `CrO_(4)^(2-)` is reduced to `+3` state of Cr
C. `CrO_(4)^(2-)` is oxidized to `+7` state of Cr
D. `Cr^(3+)` and `Cr_(2)O_(7)^(2-)` are formed