The correct order of the electron gain enthalpy of the given elements is

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$S > S e > O$

$O > S > S e$

$S e > S > O$

$O > S e > S$

answer is D.

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Detailed Solution

Electron gain enthalpy : O(-141) > Se (- 195) > (-200) in kJ /mol
Se has 10 ‘d’ ekectrons which has less shielding effect than ‘s’ or ‘p’ electrons. Therefore,
effective nuclear charge in Se is more than that of ‘S’. As a result, it has less electron gain enthalpy.

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