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Ionisation Energy

Which of the ...

Question

Which of the following isoelectronic ions have lowest ionization?

A

N a^{+}

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B

M g^{2 +}

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C

F^{-}

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D

O^{2 -}

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Solution

The correct option is D $O^{2 -}$
It is easier to eject an electron from negatively charged species than a positively charged or neutral species. Higher the negative charge, easier is the process.
Therefore, $O^{2 -}$ has lowest ionisation energy.

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Ionisation Energy

Standard XII Chemistry

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