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Question

Correct orders of 1st ionisation potential are :
(a) Li<B<Be<C

(b) O<N<F
(c) Be<N<Ne

A
a, b
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B
b, c
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C
a, c
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D
a, b, c
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Solution

The correct option is D a, b, c
Variation in period among the representative elements:
Ionisation energies generally increase along the period because in moving left to right in a period the effective nuclear charge per outermost electron increases while the corresponding principal quantum number remain same.

But IP of N is greater than oxygen due to half filled configuration. So order of IP: Li<B<Be<C<O<N<F<Ne.

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