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The first ionisation potential of Na is ...

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

A

`-2.55eV`

B

`-5.1eV`

C

`-10.2eV`

D

`+2.55eV`

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The correct Answer is:
B
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