NEET UG 2022 — Chemistry Inorganic Chemistry

2022mcqhard

Which amongst the following is incorrect statement?

Official previous-year question

Held on 30 Apr 2022 · Verified 9 Jul 2026.

Options

A
${C}_{2}$ molecule has four electrons in its two degenerate $\pi$ molecular orbitals.
B
${H}_{2}^{+}$ ion has one electron.
C
${O}_{2}^{+}$ ion is diamagnetic.
D
The bond orders of ${O}_{2}^{+},{O}_{2},{O}_{2}^{-}$ and ${O}_{2}^{2-}$ are $2.5,2,1.5$ and $1$ , respectively.

Did you get this right?

Solution

Electronic configuration of ${C}_{2}$ molecule is $(\sigma 1{s}^{2})({\sigma }^{*}1{s}^{2})(\sigma 2{S}^{2})({\sigma }^{*}2{S}^{2})(\pi 2{P}_{x}^{2}=\pi 2{\mathrm{py}}^{2})$

Hence it has $4$ electrons in $\pi$ molecular orbitals.

${{H}_{2}}^{+}$ has one electron as one electron is removed from ${H}_{2}$ molecule.
Electronic configuration of ${{O}_{2}}^{+}$ ion is

$\sigma 2{s}^{2}{\sigma }^{*}2{s}^{2}\sigma 2{p}_{2}^{2}({\pi }_{2{P}_{x}^{2}}={\pi }_{2{\mathrm{Py}}^{2}}){\pi }^{*}2{p}_{x}^{1}{\pi }^{*}2{P}_{y}^{0}$

It has one unpaired electron so it is para-magnetic.

Bond orders of ${O}_{2}^{+},{O}_{2},{O}_{2}^{-}$ and ${O}_{2}^{2-}$ are $2.5,2,1.5$ and $1$ respectively.

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NEET UG 2022 — Chemistry Inorganic Chemistry

2022mcqhard

Which amongst the following is incorrect statement?

Official previous-year question

Held on 30 Apr 2022 · Verified 9 Jul 2026.

Options

A
${C}_{2}$ molecule has four electrons in its two degenerate $\pi$ molecular orbitals.
B
${H}_{2}^{+}$ ion has one electron.
C
${O}_{2}^{+}$ ion is diamagnetic.
D
The bond orders of ${O}_{2}^{+},{O}_{2},{O}_{2}^{-}$ and ${O}_{2}^{2-}$ are $2.5,2,1.5$ and $1$ , respectively.

Did you get this right?

Solution

Electronic configuration of ${C}_{2}$ molecule is $(\sigma 1{s}^{2})({\sigma }^{*}1{s}^{2})(\sigma 2{S}^{2})({\sigma }^{*}2{S}^{2})(\pi 2{P}_{x}^{2}=\pi 2{\mathrm{py}}^{2})$

Hence it has $4$ electrons in $\pi$ molecular orbitals.

${{H}_{2}}^{+}$ has one electron as one electron is removed from ${H}_{2}$ molecule.
Electronic configuration of ${{O}_{2}}^{+}$ ion is

$\sigma 2{s}^{2}{\sigma }^{*}2{s}^{2}\sigma 2{p}_{2}^{2}({\pi }_{2{P}_{x}^{2}}={\pi }_{2{\mathrm{Py}}^{2}}){\pi }^{*}2{p}_{x}^{1}{\pi }^{*}2{P}_{y}^{0}$

It has one unpaired electron so it is para-magnetic.

Bond orders of ${O}_{2}^{+},{O}_{2},{O}_{2}^{-}$ and ${O}_{2}^{2-}$ are $2.5,2,1.5$ and $1$ respectively.

NEET UG 2022 — Chemistry Inorganic Chemistry

Options

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Solution

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NEET UG 2022 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

NEET UG Inorganic Chemistry in other years

More NEET UG Inorganic Chemistry questions

Other Chemistry topics for NEET UG

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry