RE-NEET 2026 Chemistry Ionization Enthalpy Assertion Reason Question
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:
Both A and R are correct and R is NOT the correct explanation of A.
A is correct but R is not correct.
A is not correct but R is correct.
Both A and R are correct and R is the correct explanation of A.
Correct Answer
Detailed Explanation
The first ionization enthalpy of oxygen is indeed lower than that of nitrogen and fluorine due to electron-electron repulsion in the p orbital. However, the reason provided does not correctly explain this phenomenon.
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