What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
$Cr_2O^{2-}_7$ and H2O are formed
$CrO^{2-}_4$ is reduced to +3 state of Cr
$CrO^{2-}_4$ is oxidized to +7 state of Cr
Cr3+ and $Cr_2O^{2-}_7$ are formed
