Redox Reactions And Electrochemistry Ques 449

Question: When $ KMnO_4 $ is reduced with oxalic acid in acidic solution, the oxidation number of $ Mn $ changes from [MNR 1987; MP PET 2000; CBSE PMT 2000; UPSEAT 2000, 02; BHU 2003; AMU 2002]

Options:

A) 7 to 4

B) 6 to 4

C) 7 to 2

D) 4 to 2

Show Answer

Answer:

Correct Answer: C

Solution:

$ 5\underset{COOH}{\overset{COOH}{\mathop{|}}},+\overset{+7}{\mathop{2KMnO_4}},+3H_2SO_4\to $ $ K_2SO_4+\overset{+2,}{\mathop{2MnSO_4}},+10CO_2+8H_2O $ In this reaction oxidation state of $ Mn $ change from + 7 to + 2.



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