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In KMnO₄ molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively

+1, +5, – 2

+1, +7, – 2

0, 0, 0

+1, +7, 0

+1, +7, – 2

-We know that the oxidation state of potassium and oxygen are +1 & -2. -Hence, the oxidation of Mn is +7.