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The second electron gain enthalpies (in ...

The second electron gain enthalpies (in kJ `mol^(-1)`) of oxygen and sulphur respectively are:

A

–780, +590

B

–590, +780

C

+590, +780

D

+780, +590

Text Solution

Verified by Experts

The correct Answer is:
D
`O^(-) overset(e^(-) )(to) O^(-2)` EGE = + ve , `S^(-) overset(e^(-) )(to) S^(-2)` EGE = +ve
EGE is positive when an electron is added to anion (as repulsion between negative charges) and EGE is more (+ve) in case of `O^(-)` because of it small size, so charge density increases & hence more repulsion.
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