MCQEasyJEE Main 2025 · 23 January, Shift 2Electrochemical Cells

Chemistry Question from JEE Main 2025 · 23 January, Shift 2

Standard electrode potentials for a few half-cells are mentioned below:

Half-cellStandard Electrode PotentialCu2+/Cu+0.34 VZn2+/Zn−0.76 VAg+/Ag+0.80 VMg2+/Mg−2.37 V\begin{array}{|c|c|} \hline \text{Half-cell} & \text{Standard Electrode Potential}\\ \hline \text{Cu}^{2+} / \text{Cu} & +0.34 \, \text{V}\\ \text{Zn}^{2+} / \text{Zn} & -0.76 \, \text{V}\\ \text{Ag}^+ / \text{Ag} & +0.80 \, \text{V}\\ \text{Mg}^{2+} / \text{Mg} & -2.37 \, \text{V}\\ \hline \end{array}

Which one of the following cells gives the most negative value of ΔG∘\Delta G^\circ?

  • A

    Zn ∣ Zn2+(1 M) ∣∣ Ag+(1 M) ∣ Ag\text{Zn} \,|\, \text{Zn}^{2+} (1\,\text{M}) \,||\, \text{Ag}^+ (1\,\text{M}) \,|\, \text{Ag}

  • B

    Zn ∣ Zn2+(1 M) ∣∣ Mg2+(1 M) ∣ Mg\text{Zn} \,|\, \text{Zn}^{2+} (1\,\text{M}) \,||\, \text{Mg}^{2+} (1\,\text{M}) \,|\, \text{Mg}

  • C

    Ag ∣ Ag+(1 M) ∣∣ Mg2+(1 M) ∣ Mg\text{Ag} \,|\, \text{Ag}^+ (1\,\text{M}) \,||\, \text{Mg}^{2+} (1\,\text{M}) \,|\, \text{Mg}

  • D

    Cu ∣ Cu2+(1 M) ∣∣ Ag+(1 M) ∣ Ag\text{Cu} \,|\, \text{Cu}^{2+} (1\,\text{M}) \,||\, \text{Ag}^+ (1\,\text{M}) \,|\, \text{Ag}

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