The first ionisation potential of Na is ...

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of `Na^(+)` will be:-

A

`-2.55` eV

B

`-5.1` eV

C

`10.2` eV

D

`+2.55` eV

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The correct Answer is:

B

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