Out of $N a^{+}, M g^{+ 2}, O^{- 2}$ and $N^{- 3}$ , the pair of species having the minimum and the maximum IP would be?

N a^{+}, M g^{+ 2}

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M g^{+ 2}, N^{- 3}

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N^{- 3}, M g^{+ 2}

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O^{- 2}, N^{- 3}

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Solution

The correct option is C $N^{- 3}, M g^{+ 2}$
It is easier to remove electron from negative species and difficult to remove electron from positive species. Thus its easiest to remove electron from $N^{3 -}$ and difficult for ${M g}^{2 +}$

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Question 20

In which of the following pairs, the ions are isoelectronic ?

(a) $N a^{+}, M g^{2 +}$ (b) $A l^{3 +}, O^{-}$ (c) $N a^{+}, O^{2 -}$ (d) $N^{3 -}, C l^{-}$

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