Given below are two statements. One is labelled as Assertio…

Chemistry Classification of Elements and Periodicity JEE Main 2022 Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 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 for oxygen is lower than that of nitrogen.

Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion.

choose the correct answer from the options given below.

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

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

A is correct but R is not correct.

A is not correct but R is correct

Text Solution

Verified by Experts

The correct answer is:

Ionisation energy = N > O.

In oxygen atom, 2 of the 4 2p electrons must occupy the same 2p orbital resulting in an increased electron electron-repulsion.

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