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Q.

The ionisation energy of nitrogen is more than that of oxygen because

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a

Of the extra stability of half-filled p-orbitals in nitrogen

b

Of the smaller size of nitrogen

c

The former is less electronegative

d

The former contains less number of electrons

answer is A.

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Detailed Solution

Due to extra stability of half-filled p-subshell

IP of N > IP of O

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The ionisation energy of nitrogen is more than that of oxygen because