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NEET 2026 Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesNEET 2026

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 orbital In light of the above statements, choose the most appropriate answer from the options given below:

Answer: (1)

Solution

First ionization enthalpies (kJ/mol): N = 1402, O = 1314, F = 1681. So O is lower than both N and F: Assertion A is true. Oxygen is ; removing one electron (from the paired orbital, which also relieves inter-electronic repulsion) gives =

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Question ID VK-105056