JEE Main Chemistry question

Statement 1: Nobel gases have large positive electron gain enthalpy. Statement 2: Electron has the enter the next higher principal quantum level.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

Noble gases have a completely filled valence shell, so any additional electron cannot enter that shell and must instead start a new, higher-energy principal shell — this is energetically very unfavourable, giving

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Question ID VK-133219