Question

Why potassium dichromate is orange in colour?

Answer 1

Potassium dichromate is an oxidising agent in organic chemistry, and is milder than potassium permanganate.... Aldehydes reduce dichromate from the +6 to the +3 oxidation state, changing colour from orange to green. This colour change arises because the aldehydes can be oxidized to the corresponding carboxylic acid.

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