Assertion (A) : First ionization energy of nitrogen is lower than that of oxygen.
Reason (R) : Across the period effective nuclear charge increases.

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Both A and R are correct and R is the correct explanation of A.

A is incorrect, R is correct.

A is correct, R is incorrect.

Both A and R are correct but R is not the correct explanation of A.

answer is D.

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Detailed Solution

Assertion: It is incorrect. N atomic number is $7, 1 s^{2} 2 s^{2} 2 p^{3}$ Question Image half –filled stable configuration, while for O- atomic number is $8, 1 s^{2} 2 s^{2} 2 p^{4}$ , partially filled unstable configuration . Therefore First ionization energy of nitrogen is more than that of oxygen.