Statement (A): Oxidation number of Mn in ${KMnO}_{4}$ is +7.
Statement (B): The oxidation number of an atom in its elementary form is zero.
Statement (C): Sodium exhibits +2 oxidation state.

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All the above statements are correct

All the above statements are incorrect

A and B are correct but C is incorrect

A and B are incorrect but C is correct

answer is C.

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Detailed Solution

(i) According to oxidation number rules, first two statements are correct, statement III is incorrect.

Oxidation state of Mn in ${KMnO}_{4}$

$\begin{array}{l} \Rightarrow + 1 + x + (- 2 \times 4) = 0 \\ + 1 + x + (- 8) = 0 \\ x = + 7 \end{array}$

Sodium exhibits +1 oxidation state but not +2.

(ii) The oxidation number of an atom in its elementary form is zero.

(iii) Sodium exhibits +1 oxidation state because it is in IA group.

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