JEE Main 2019 — Chemistry Physical Chemistry

2019mcqhard

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of ${\mathrm{CO}}_{2}$ is:

Official previous-year question

Held on 10 Jan 2019 · Verified 6 Jul 2026.

Options

A
$2$
B
$10$
C
$1$
D
$5$

Did you get this right?

Solution

$2 {\mathrm{MnO}}_{4}^{-}+5{C}_{2}{O}_{4}^{2-}+16{H}^{+}\rightarrow 10 {\mathrm{CO}}_{2}+2 {\mathrm{Mn}}^{2+}+8{H}_{2}O$

$C$ goes from $+3$ oxidation state to $+4$ oxidation state.

Total $10{e}^{-}$ are transferred for $10$ molecules of ${\mathrm{CO}}_{2}$ .

Hence, for $1$ molecule of ${\mathrm{CO}}_{2}$ , only one ${e}^{-}$ is transferred.

So, number of electrons involved for $1$ molecule of ${\mathrm{CO}}_{2}$ is $1$ .

Your note

JEE Main Physical Chemistry in other years

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

Keep practicing Physical Chemistry

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

Browse all Chemistry topics

JEE Main 2019 — Chemistry Physical Chemistry

2019mcqhard

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of ${\mathrm{CO}}_{2}$ is:

Official previous-year question

Held on 10 Jan 2019 · Verified 6 Jul 2026.

Options

A
$2$
B
$10$
C
$1$
D
$5$

Did you get this right?

Solution

$2 {\mathrm{MnO}}_{4}^{-}+5{C}_{2}{O}_{4}^{2-}+16{H}^{+}\rightarrow 10 {\mathrm{CO}}_{2}+2 {\mathrm{Mn}}^{2+}+8{H}_{2}O$

$C$ goes from $+3$ oxidation state to $+4$ oxidation state.

Total $10{e}^{-}$ are transferred for $10$ molecules of ${\mathrm{CO}}_{2}$ .

Hence, for $1$ molecule of ${\mathrm{CO}}_{2}$ , only one ${e}^{-}$ is transferred.

So, number of electrons involved for $1$ molecule of ${\mathrm{CO}}_{2}$ is $1$ .

JEE Main 2019 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry

JEE Main 2019 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry