Practice question
Question
What happens when K 2 Cr 2 O 7 is treated with an alkali?
Explanation
Dichromate (Cr 2 O 7 2− ) converts to chromate (CrO 4 2− ) in alkaline medium: Cr 2 O 7 2− + 2OH − → 2CrO 4 2− + H 2 O. The solution turns yellow due to chromate formation.
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