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Chemical Reactivity (Group 1)

Among KO2, Na...

Question

Among $K O_{2}, N a_{2} O$ and $B a O_{2}$ unpaired electron(s) is/are present in:

A

$N a_{2} O$ and $B a O_{2}$

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B

$K O_{2}$ and $B a O_{2}$

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C

$K O_{2}$ only

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D

$B a O_{2}$ only

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Solution

The correct option is C
$K O_{2}$ only

This essentially boils down to the differences in the magnetic nature of the normal oxide $O_{2}^{-}$ , the peroxide $O_{2}^{2 -}$ and the superoxide $O_{2}^{-}$ ions. Among these - the oxide and the peroxide do not contain unpaired electrons whereas the superoxide is paramagnetic (it has an unpaired electron).

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