(A) In $KO_{2}$,potassium $(K)$ is an alkali metal and always exhibits an oxidation state of $+1$. The superoxide ion is $O_{2}^{-}$,where the oxidati

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The oxidation number of $K$ in $KO_{2}$ is $+4$.

(A) In $KO_{2}$,potassium $(K)$ is an alkali metal and always exhibits an oxidation state of $+1$. The superoxide ion is $O_{2}^{-}$,where the oxidation state of oxygen is $-1/2$. Therefore,the statement that the oxidation number of $K$ in $KO_{2}$ is $+4$ is incorrect. The correct oxidation number of $K$ is $+1$.

Class 11 Chemistry s-Block Elements Alkali metals

Easy

Identify the incorrect statement from the following.

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A
The oxidation number of $K$ in $KO_{2}$ is $+4$.
B
Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
C
Lithium is the strongest reducing agent among the alkali metals.
D
Alkali metals react with water to form their hydroxides.