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Q.

Generally the ionization potential in a period increases, but there are some exceptions. The one which is not an exception is

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a

Be&B

b

Mg &Al

c

N&O

d

Na & Mg

answer is D.

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Detailed Solution

Be(Z=4)1s22s2; B(z=5)1s22s22p1

Therefore, I.E of Be > I.E of B. is completely filled and is incompletely filled. So, IE of Be > B

N(Z=7)1s22s22p3; Half filled configuration

O(Z=8) 1s22s22p4; Hence,I.E of N > I.E of O

Mg(Z=12)1s22s22p63s2; inert pair effect;

Al(Z=13)1s22s22p63s23p1; So that IE of Mg>I.E of Al

Na (Z=11)1s22s22p63s1; Mg (Z=12)1s22s22p63s2

Note: Here I.E of Na < I.E of Mg

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