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MHT CET Chemistry question

ChemistryElectrochemistryMHT CET

V, V. The value of standard electrode potential for the change, \mathrm{Fe^{3+}(aq) + e^- \to Fe^{2+}(aq)} will be

Answer: (C)

Solution

Free energies add, not potentials: \Delta G^\circ(\mathrm{Fe^{3+}\to Fe^{2+}}) = \Delta G^\circ(\mathrm{Fe^{3+}\to Fe}) - \Delta G^\circ(\mathrm{Fe^{2+}\to Fe}), so

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Question ID VK-066941