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

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The first ionisation potential of `Na` is `5.1eV`. The value of eectrons gain enthalpy of `Na^(+)` will be
A. `-5.1 eV`
B. `-10.2 eV`
C. + 2.55 eV
D. `-2.55 eV`
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Correct Answer - A
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