What happen when a solution of potassium chromate is treated with an excess of dil. Nitic acid?
A. `Cr^(3+) and Cr_2O_(7)^(2-)` are formed
B. `Cr_2O_7^(2-) and H_(2)O` are formed
C. `CrO_4^(2-)` is reduced to +3 state of Cr
D. `CrO_(4)^(2-)` is oxidized to +7 state of Cr
