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Question

What is the oxidation number of Mn in KMnO4, K2MnO4, MnSO4, MnO2 and Mn3O4 respectively?
  1. +4,+6,+2,+4, +83
  2. +7,+6,+2,+4, +83
  3. +7,+6,+2,+3, +83
  4. None of these

A
+4,+6,+2,+4, +83
B
+7,+6,+2,+3, +83
C
+7,+6,+2,+4, +83
D
None of these
Solution
Verified by Toppr

The correct option is A +7,+6,+2,+4, +83
Let x be the oxidation number of Mn.
Since, the overall charge on the complex is 0, the sum of oxidation states of all elements in it should be equal to 0.
K2MnO4; 2+x+4(2)=0;x=+6

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