Redox Reactions And Electrochemistry Ques 473

Question: The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is [AIEEE 2005]

Options:

A) +4

B) +6

C) +2

D) +3

Show Answer

Answer:

Correct Answer: D

Solution:

$ K_2Cr_2O_7+6KI+7H_2SO_4\to 4K_2SO_4+Cr_2{{(SO_4)}_3} $ $ +7H_2O+3I_2 $ $ \overset{*}{\mathop{C}},r_2{{(SO_4)}_3}\to 2\overset{+3}{\mathop{Cr}},+3SO_4^{2-} $



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