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What is observed when an excess of dilute nitric acid is added to a solution of potassium chromate?

1. Dichromate ions and water are produced.
2. Chromate ions are reduced to chromium in the +3 oxidation state.
3. Chromate ions are oxidized to chromium in the +7 oxidation state.
4. Chromium(III) ions and dichromate ions are produced.

Correct answer: Dichromate ions and water are produced.

Solution

When dilute nitric acid is added to potassium chromate, the acidic environment facilitates the conversion of chromate ions to dichromate ions, which is a common reaction in acidic solutions, resulting in the formation of dichromate ions and water.

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