Redox Reactions And Electrochemistry Ques 418
Question: When $ SO_2 $ is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chromium is [CPMT 1979]
Options:
A) +4 to +2
B) +5 to +3
C) +6 to +3
D) +7 to +2
Show Answer
Answer:
Correct Answer: C
Solution:
$ \overset{+6}{\mathop{K_2Cr_2O_7}},+3SO_2+H_2SO_4\to $ $ K_2SO_4+\overset{,+3}{\mathop{Cr_2{{(SO_4)}_3}}},+H_2O $ In this reaction chromium change from + 6 to +3 oxidation state.
