Which one of the following ion is the smallest ion?

O_{2}

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O_{2}^{+}

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O_{2}^{-}

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O_{2}^{2 -}

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Solution

The correct option is B $O_{2}^{+}$
The increasing order of size is as follows:
$O_{2}^{+} < O_{2} < O_{2}^{-} < O_{2}^{- 2}$

$O_{2}^{+}$ is the smallest ion. if positive charge increases size will decrease.

So, the answer is option B.

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