JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Classification of Elements and Periodicity

The difference between electron gain enthalpies will be maximum between:

(A)Ne and F
(B)Ne and Cl✓ Correct
(C)Ar and Cl
(D)Ar and F

Answer: (B)

Solution

Chlorine has the most negative (most exothermic) electron gain enthalpy of all elements, while neon, with its complete octet, has a large positive (endothermic) electron gain enthalpy because an added electron must enter a new shell. The gap between a strongly favourable gain and a strongly unfavourable one is therefore widest for neon and chlorine.

JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Single correct option

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