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Question: When \(KMnO_{4}\) is reduced with oxalic acid in acidic solution, the oxidation number of \(Mn\) cha...

When KMnO4KMnO_{4} is reduced with oxalic acid in acidic solution, the oxidation number of MnMn changes from.

A

7 to 4

B

6 to 4

C

7 to 2

D

4 to 2

Answer

7 to 2

Explanation

Solution

2KMnO4+3H2SO4+5C2H2O4⥂→2KMnO_{4} + 3H_{2}SO_{4} + 5C_{2}H_{2}O_{4} ⥂ \rightarrow

2Mn2++8H2O+10CO22Mn^{2 +} + 8H_{2}O + 10CO_{2}