Correct Answer: Option C

Explanation

Acidified potassium dichromate (K\(_2\)Cr\(_2\)O\(_7\)) is a strong oxidizing agent that undergoes a distinct colour change during redox reactions. In an acidic medium, the chromium is present in the dichromate ion (Cr\(_2\)O\(_7\)\(^{2-}\)), where it has an oxidation state of +6. This ion gives the solution its characteristic orange colour.

When it acts as an oxidizing agent, it accepts electrons and is reduced to chromium(III) ions (Cr\(^{3+}\)), where the oxidation state is +3. The formation of Cr\(^{3+}\) ions (often as chromium(III) sulfate in sulphuric acid solutions) turns the solution green.

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