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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Regarding electron gain enthalpy (magnitude) the correct relation is

A)

{S}>{Se}>{Te}>{O}

{Cl}>{Br}>{F}>{I}

{Ne}>{Ar}>{Xe}>{He}

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Correct option: A

A and C only

Option A (A and C only) is correct because the electron gain enthalpy trend generally increases up a group, but oxygen has an anomaly, and noble gases have positive electron gain enthalpies.

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