The isoelectronic ion having lowest ioni...

The isoelectronic ion having lowest ionisation energy is

A

`K^(+)`

B

`Ca^(2+) `

C

`Cl^(-)`

D

`S^(2-)`

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The correct Answer is:

D

Since the size of `S^(2-)` amongst the isoelectronic species is the largest, its ionisation energy will be the lowest.

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