In the ions $P^{3 -}, S^{2 -}$ and $C I^{-}$ the increasing order of size is:

C I^{-}, S^{2 -}, P^{3 -}

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P^{3 -}, S^{2 -}, C I^{-}

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S^{2 -}, C I^{-}, P^{3 -}

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S^{2 -}, P^{3 -}, C I^{-}

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Solution

The correct option is D $C I^{-}, S^{2 -}, P^{3 -}$

All of these are isoelectronic.
In isoelectronic species, as the number of protons (atomic number) goes on increasing, size goes on decreasing due to the stronger attraction on the electrons.
So, $C I^{-} < S^{2 -} < P^{3 -}$

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