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Ionic Bond

In the ions ...

Question

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

C l^{-} < S^{2 -} < P^{3 -}

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P^{3 -} < S^{2 -} < C l^{-}

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S^{2 -} < C l^{-} < P^{3 -}

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S^{2 -} < P^{3 -} < C l^{-}

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Solution

The correct option is A $C l^{-} < S^{2 -} < P^{3 -}$
Given ions are isoelectronic, So the relation between size can be determined by z/e ratio.
$P^{3 -} > S^{2 -} > C l^{-}$ $⟹$ Increasing z/e ratio
So, order of size will be $⟹ C l^{-} < S^{2 -} < P^{3 -}$
Option $A$ is correct.

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