Question

What would happen when a solution of potassium chromate is treated with an excess of dilute HNO3?

• A. Cr2O72– and H2O are formed
• B. CrO42– is reduced to +3 state of Cr
• C. CrO42– is oxidised to +7 state of Cr
• D. Cr3+ and Cr2O72– are formed

Answer 1

Answer: (A)

Cr2O72– and H2O are formed

Answer 2

2CrO42- + 2H+ $\longrightarrow$ Cr2O72– + H2O.