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Q.

The ionization enthalpy of nitrogen is more than that of oxygen because of :

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a

Greater attraction of nucleus for the electrons

b

The extra stability of half filled p-orbitals

c

Smaller size of the nitrogen atom

d

More penetrating effect.

answer is B.

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Detailed Solution

I.E of nitrogen > I.E of oxygen.

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Half filled (or) completely filled orbitals are more stable to remove the electron more difficult. 

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