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The order of electron gain enthalpy (magnitude) of `O, S` and `Se` is:

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The order of electron gain enthalpy (magnitude) of `O, S` and `Se` is:
A. `O gt S gt Se`
B. `S gt Se gt O`
C. `Se gt S gt O`
D. `S gt O gt Se`
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Correct Answer - B
`O` has exceptionally smaller value of electron affinity (minimum in family) due to smaller atomic size than sulphur (weaker electron-electron repulsion is larger `3p`-subshell).
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