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The first ionization enthalpies of Be, B, N and O follow the order

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B < Be < O < N

B < Be < N < O

Be < B < N < O

O < N < B < Be

answer is D.

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Detailed Solution

1^st I.E. $\underset{(2 p^{3})}{N} > \underset{(2 p^{4})}{O} > \underset{(2 s^{2})}{Be} > \underset{(2 p^{1})}{B}$

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