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The colour of K(2)Cr(2)O(7) changes from...

The colour of `K_(2)Cr_(2)O_(7)` changes from red-orange to lemon-yellow on treatment with `KOH_((aq.))`, because of:

A

The reduction of `Cr^(VI)` to `Cr^(III)`

B

The formation of chromium hydroxided

C

The conversion of dichromate to chromate

D

The oxidation of potassium hydroxide to potassium peroxide

Text Solution

Verified by Experts

The correct Answer is:
C
The conversion of dichromate to chromate.
`K_(2) Cr_(2) O_(7) + 2 KOH rarr underset(yellow) underbrace(2K_(2) Cr O_(4)) + H_(2) O`
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