Among the following simple Ion is

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$P O_{4}^{- 3}$

$S O_{4}^{- 2}$

$O^{-}$

$S O_{3}^{- 2}$

answer is C.

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Detailed Solution

Among the given choices the simple ion is $O^{-}$ because it is formed from a single atom .rest of them are polyatomic which are made up of more number of atoms.

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