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Question

What is the oxidation number of Mn in MnO2?


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Solution

Oxidation number: Oxidation number denotes the oxidation state of an element in a compound ascertained according to a set of rules formulated on the basis that electron pair in a covalent bond belongs entirely to a more electronegative element.

Calculating the oxidation number of Manganese(Mn) in MnO2:

The oxidation state of Oxygen(O) = -2

Consider the oxidation state of Manganese(Mn) = x

Now,

x+-2×2=0x=+4

Hence, the oxidation number of Mn in MnO2 is +4.


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