JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqmedium

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.

In the light of the above statements, choose the correct answer from the options given below.

Official previous-year question

Held on 29 Jun 2022 · Verified 6 Jul 2026.

Options

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$ .
B
Both $A$ and $R$ are correct but $R$ is NOT the correct explanation of $A$ .
C
$A$ is correct but $R$ is not correct.
D
$A$ is not correct but $R$ is correct

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Solution

Ionization energy of oxygen is less than that of nitrogen because $2p$ subshell of nitrogen is half filled, and half filled orbitals have some extra stability, so removing electrons from them will be little more difficult.

And In oxygen atom, $2$ of the $\mathrm{four}2p$ electrons must occupy the same $2p$ orbital resulting in an increased electron electron-repulsion.

$N=1{s}^{2}2{s}^{2}2{p}^{3}$

$O=1{s}^{2}2{s}^{2}2{p}^{4}$

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Solution

And In oxygen atom, $2$ of the $\mathrm{four}2p$ electrons must occupy the same $2p$ orbital resulting in an increased electron electron-repulsion.

$N=1{s}^{2}2{s}^{2}2{p}^{3}$

$O=1{s}^{2}2{s}^{2}2{p}^{4}$

JEE Main 2022 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

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JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

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Physical Chemistry

Organic Chemistry

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JEE Main 2022 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry