Gce Model Questions Vol1 2025 Chemistry Question 41
Practice objective / multiple choice question 41 from the 2025 Gce Model Questions Vol1 Chemistry examination.
Metal Z forms oxide ZO with standard enthalpy of formation \( \Delta H_f^\circ = -80\ \text{kJ mol}^{-1} \) and entropy of formation \( \Delta S_f^\circ = -100\ \text{J K}^{-1}\text{mol}^{-1} \). Carbon reduces ZO according to \( \text{ZO} + \text{C} \rightarrow \text{Z} + \text{CO} \). The standard enthalpy and entropy of formation of CO are \( \Delta H_f^\circ = -110.5\ \text{kJ mol}^{-1} \) and \( \Delta S_f^\circ = -197\ \text{J K}^{-1}\text{mol}^{-1} \) respectively. Assuming \( \Delta H \) and \( \Delta S \) are temperature‑independent, determine the minimum temperature (in K, to the nearest whole number) at which the reduction becomes spontaneous (\( \Delta G < 0 \)).
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This is Gce Model Questions Vol1 2025 Chemistry Question 41. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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