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 $
