Which of the following isoelectronic ions have lowest ionisation energy?

K^{+}

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C a^{2 +}

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C l^{-}

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S^{2 -}

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Solution

The correct option is D $S^{2 -}$
It is easier to eject an electron from a negatively charged species than a positively charged species. Thus higher the negative charge, easier is the process.

Thus lowest IE among given option is $S^{2 -}$

Hence, the correct option is $D$

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