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The oxidation number of Mn in KMnO4 is +7
Explanation:
We know that the oxidation numbers should add up to 0.So in KMnO4, Pottasium has an oxidation number of 1 and Oxygens is -2.
Let us say that the oxidation number of Mn is x
So, taking the number of atoms into consideration
1(K) + x(Mn) + (4 * (-2)) (4 atoms of O) = 0
=> 1 + x – 8 = 0
=> x or Oxidation number of Mn = 7
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