Neco 2023 Chemistry Question 15

Practice objective / multiple choice question 15 from the 2023 Neco Chemistry examination.

Neco 2023 Chemistry Objective / Multiple Choice Hard Difficulty
Question 15 NECO • 2023 • CHEMISTRY • objective

Consider the redox reaction \(\mathrm{Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)}\). (a) Using standard reduction potentials \(E^{\circ}(\mathrm{Cu^{2+}/Cu}) = +0.34\ \text{V}\) and \(E^{\circ}(\mathrm{Fe^{2+}/Fe}) = -0.44\ \text{V},\) calculate the standard cell potential \(E^{\circ}_{cell}\) and the standard Gibbs free energy change \(\Delta G^{\circ}\). (b) If the actual concentrations are \([\mathrm{Fe^{2+}}]=0.010\ \text{M}\) and \([\mathrm{Cu^{2+}}]=0.10\ \text{M},\) determine the cell potential at 25 °C.

Answer Options

A. E°cell = 0.70 V; ΔG° = -1.35×10⁵ J mol⁻¹; E (non‑standard) ≈ 0.73 V
B. E°cell = 0.82 V; ΔG° = -1.55×10⁵ J mol⁻¹; E (non‑standard) ≈ 0.85 V
Correct Answer C. E°cell = 0.78 V; ΔG° = -1.51×10⁵ J mol⁻¹; E (non‑standard) ≈ 0.81 V
D. E°cell = 0.78 V; ΔG° = -1.45×10⁵ J mol⁻¹; E (non‑standard) ≈ 0.79 V
Correct Answer
C
Correct Option:
E°cell = 0.78 V; ΔG° = -1.51×10⁵ J mol⁻¹; E (non‑standard) ≈ 0.81 V

About This Question

This is Neco 2023 Chemistry Question 15. It is one of the objective questions from the 2023 Neco Chemistry examination.

Difficulty level: Hard .

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