JEE Main Chemistry question

Generally, the first ionisation energy increases along a period. But there are some exceptions. One which is not an exception is [K CET 2010]

(A)N and O
(B)Na and MgCorrect
(C)Mg and Al
(D)Be and B

Answer: (B)

Solution

Na (Group 1) to Mg (Group 2) follows the normal expected rise in ionisation energy across the period, with no anomaly, since Mg's filled offers genuinely extra stability consistent with a straightforward increase from Na. In contrast, N→O (O lower due

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Question ID VK-133207