Question

What would happen when a solution of potassium

chromate is treated with an excess of dilute nitric acid ?

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

Answer 1

Answer: (B)

Cr2O72– and H2O are formed

Answer 2

Dilute nitric acid converts chromate into dichromate

according to the following chemical reaction.

2K2 CrO4 + 2HNO3 $\rightarrow$ K2Cr2O7 + 2KNO3 + H2O.