Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from:

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Concept: Reduction of  in acidic medium

In acidic solution,  acts as an oxidising agent:

- Cr in : +6
- Cr in : +3

Change: +6 → +3 (gain of 3 electrons per Cr atom, 6 electrons total for 2 Cr)

The green colour of  is observed at the end of the reaction.

Answer: Option (2) — +6 to +3

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