Gce Model Questions Vol1 2024 Chemistry Question 40

Practice objective / multiple choice question 40 from the 2024 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 40 GCE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

Consider the redox reaction \(\text{Fe(s)} + \text{Cu}^{2+}(aq) \rightarrow \text{Fe}^{2+}(aq) + \text{Cu(s)}\). The standard reduction potentials are \(E^{\circ}_{\text{Fe}^{2+}/\text{Fe}} = -0.44\ \text{V}\) and \(E^{\circ}_{\text{Cu}^{2+}/\text{Cu}} = +0.34\ \text{V}\). (i) Calculate the standard cell potential \(E^{\circ}_{\text{cell}}\), the standard Gibbs free energy change \(\Delta G^{\circ}\) and the equilibrium constant \(K\) at \(298\ \text{K}\). (ii) Assuming the enthalpy change for the reaction is approximately \(\Delta H^{\circ} = -1.0\times10^{5}\ \text{J\ mol}^{-1}\), estimate the equilibrium constant at \(350\ \text{K}\) using the van\'t Hoff equation.

Answer Options

Correct Answer A. E^{\circ}_{\text{cell}} = 0.78\ \text{V}; \Delta G^{\circ} \approx -1.5\times10^{5}\ \text{J\ mol}^{-1}; K_{298\text{K}} \approx 1\times10^{26}; K_{350\text{K}} \approx 3\times10^{23}
B. E^{\circ}_{\text{cell}} = 0.68\ \text{V}; \Delta G^{\circ} \approx -1.2\times10^{5}\ \text{J\ mol}^{-1}; K_{298\text{K}} \approx 2\times10^{25}; K_{350\text{K}} \approx 5\times10^{22}
C. E^{\circ}_{\text{cell}} = 0.88\ \text{V}; \Delta G^{\circ} \approx -1.7\times10^{5}\ \text{J\ mol}^{-1}; K_{298\text{K}} \approx 5\times10^{26}; K_{350\text{K}} \approx 1\times10^{24}
D. E^{\circ}_{\text{cell}} = 0.70\ \text{V}; \Delta G^{\circ} \approx -1.4\times10^{5}\ \text{J\ mol}^{-1}; K_{298\text{K}} \approx 3\times10^{25}; K_{350\text{K}} \approx 2\times10^{23}
Correct Answer
A
Correct Option:
E^{\circ}_{\text{cell}} = 0.78\ \text{V}; \Delta G^{\circ} \approx -1.5\times10^{5}\ \text{J\ mol}^{-1}; K_{298\text{K}} \approx 1\times10^{26}; K_{350\text{K}} \approx 3\times10^{23}

About This Question

This is Gce Model Questions Vol1 2024 Chemistry Question 40. It is one of the objective questions from the 2024 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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