D-And F-Block Elements Ques 54

Question: The colour of $ K_2Cr_2O_7 $ changes from red orange to lemon yellow on treatment with aqueous $ KOH $ because of

[MP PMT 1994]

Options:

A) The reduction of $ Cr^{VI} $ to $ Cr^{III} $

B) The formation of chromium hydroxide

C) The conversion of dichromate to chromate

D) The oxidation of potassium hydroxide to potassium peroxide

Show Answer

Answer:

Correct Answer: C

Solution:

The conversion of dichromate to chromate. $ K_2Cr_2O_7+2KOH\to \underbrace{2K_2CrO_4}_{yellow}+H_2O $



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