1.

The first ionisation potential of `Na` is `5.1eV`. The value of eectrons gain enthalpy of `Na^(+)` will beA. `-2.55 eV`B. `-5.1` eVC. `-10.2 eV`D. 2.55 eV

Answer» Correct Answer - 2
`Na to Na^(+)+e^(-), I.P. =+5.1 eV`
`Na^(+) + e to Na to DeltaH_(eg) =-5.1 eV`


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