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The first ionization enthalpy of oxygen ...

The first ionization enthalpy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

A

Less effective nuclear charge of oxygen than nitrogen

B

Lesser atomic size of oxygen than nitrogen.

C

Greater inter electron repulsion between two electrons in the same p-orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen.

D

Greater effective nuclear charge of oxygen than nitrogen.

Text Solution

Verified by Experts

The correct Answer is:
C
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