JEE Main 2023 — Chemistry Physical Chemistry

2023mcqhard

The standard electrode potential ( ${M}^{3+}/{M}^{2+}$ ) for $V,\mathrm{Cr},\mathrm{Mn}$ & $\mathrm{Co}$ are $-0.26V,-0.41V,+1.57V$ and $+1.97V$ , respectively. The metal ions which can liberate ${H}_{2}$ from a dilute acid are

Official previous-year question

Held on 29 Jan 2023 · Verified 6 Jul 2026.

Options

A
${V}^{2+}$ and ${\mathrm{Mn}}^{2+}$
B
${\mathrm{Cr}}^{2+}$ and ${\mathrm{Co}}^{2+}$
C
${V}^{2+}$ and ${\mathrm{Cr}}^{2+}$
D
${\mathrm{Mn}}^{2+}$ and ${\mathrm{Co}}^{2+}$

Did you get this right?

Solution

The ${E}^{\circleddash }$ values for the redox couple ( ${M}^{3+}/{M}^{2+}$ ) shows that ${\mathrm{Mn}}^{2+}$ and ${\mathrm{Co}}^{2+}$ ions are the strongest oxidising agents in aqueous solution.

The ions ${\mathrm{Ti}}^{2+},{V}^{2+}\mathrm{and}{\mathrm{Cr}}^{2+}$ are strong reducing agents and will liberate hydrogen from a dilute acid.

So, the Correct answer is ${V}^{2+}\mathrm{and}{\mathrm{Cr}}^{2+}$ .

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JEE Main Physical Chemistry in other years

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JEE Main 2023 — Chemistry Physical Chemistry

2023mcqhard

Official previous-year question

Held on 29 Jan 2023 · Verified 6 Jul 2026.

Options

A
${V}^{2+}$ and ${\mathrm{Mn}}^{2+}$
B
${\mathrm{Cr}}^{2+}$ and ${\mathrm{Co}}^{2+}$
C
${V}^{2+}$ and ${\mathrm{Cr}}^{2+}$
D
${\mathrm{Mn}}^{2+}$ and ${\mathrm{Co}}^{2+}$

Did you get this right?

Solution

The ${E}^{\circleddash }$ values for the redox couple ( ${M}^{3+}/{M}^{2+}$ ) shows that ${\mathrm{Mn}}^{2+}$ and ${\mathrm{Co}}^{2+}$ ions are the strongest oxidising agents in aqueous solution.

The ions ${\mathrm{Ti}}^{2+},{V}^{2+}\mathrm{and}{\mathrm{Cr}}^{2+}$ are strong reducing agents and will liberate hydrogen from a dilute acid.

So, the Correct answer is ${V}^{2+}\mathrm{and}{\mathrm{Cr}}^{2+}$ .

Your note

JEE Main Physical Chemistry in other years

Keep practicing Physical Chemistry

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

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JEE Main 2023 — Chemistry Physical Chemistry

Options

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Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

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JEE Main 2023 — 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