JEE Main 2019 — Chemistry Inorganic Chemistry

2019mcqmedium

Among the following species, the diamagnetic molecule is:

Official previous-year question

Held on 9 Apr 2019 · Verified 6 Jul 2026.

Options

A
$CO$
B
${B}_{2}$
C
${O}_{2}$
D
$NO$

Did you get this right?

Solution

(1) ${B}_{2}(10)\Rightarrow \sigma {1s}^{2}, \overset{*}{\sigma }{1s}^{2}, \sigma 2{s}^{2},\overset{*}{\sigma }2{s}^{2},\pi 2{p}_{x}^{1}=\pi 2{p}_{y}^{1}$ , paramagnetic

(2) $NO(15)\Rightarrow \sigma 1{s}^{2}\overset{*}{\sigma }1{s}^{2}\overset{*}{\sigma }2{s}^{2}\sigma 2{p}_{z}^{2}\pi 2{p}_{x}^{2}=\pi 2{p}_{y}^{2}={\pi }^{*}2{p}_{x}^{1}$ , paramagnetic

(3) ${O}_{2}(16)\Rightarrow \sigma 1{s}^{2}\overset{*}{\sigma }1{s}^{2}\sigma 2{s}^{2}\overset{*}{\sigma }2{p}_{z}^{2}\pi 2{p}_{x}^{2}=\pi 2{p}_{y}^{2}{\pi }^{*}2{p}_{x}^{1}={\pi }^{*}2{p}_{y},$ paramagnetic

(4) $CO(14)\Rightarrow \sigma 1{s}^{2}\overset{*}{\sigma }1{s}^{2},\sigma 2{s}^{2},\overset{*}{\sigma }2{s}^{2},\pi {p}_{x}^{2}=\pi 2{p}_{y}^{2},\sigma 2{p}_{z}^{2},$ diamagnetic (No unpaired electron)

Your note

JEE Main Inorganic Chemistry in other years

Inorganic Chemistry 2026 Inorganic Chemistry 2025 Inorganic Chemistry 2024 Inorganic Chemistry 2023 Inorganic Chemistry 2022 Inorganic Chemistry 2021 Inorganic Chemistry 2020 Inorganic Chemistry 2018 Inorganic Chemistry 2017 Inorganic Chemistry 2016 Inorganic Chemistry 2015 Inorganic Chemistry 2014

Keep practicing Inorganic Chemistry

Work through every JEE Main Inorganic Chemistry PYQ, year by year.

Browse all Chemistry topics

JEE Main 2019 — Chemistry Inorganic Chemistry

2019mcqmedium

Among the following species, the diamagnetic molecule is:

Official previous-year question

Held on 9 Apr 2019 · Verified 6 Jul 2026.

Options

A
$CO$
B
${B}_{2}$
C
${O}_{2}$
D
$NO$

Did you get this right?

Solution

(1) ${B}_{2}(10)\Rightarrow \sigma {1s}^{2}, \overset{*}{\sigma }{1s}^{2}, \sigma 2{s}^{2},\overset{*}{\sigma }2{s}^{2},\pi 2{p}_{x}^{1}=\pi 2{p}_{y}^{1}$ , paramagnetic

(2) $NO(15)\Rightarrow \sigma 1{s}^{2}\overset{*}{\sigma }1{s}^{2}\overset{*}{\sigma }2{s}^{2}\sigma 2{p}_{z}^{2}\pi 2{p}_{x}^{2}=\pi 2{p}_{y}^{2}={\pi }^{*}2{p}_{x}^{1}$ , paramagnetic

JEE Main 2019 — 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

JEE Main 2019 — 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