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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

NTA Abhyas 2020 · Chemistry · General Principles and Processes of Isolation of Metals

Which of the following statements, about the advantage of roasting...

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

Options

  1. Athe magnitude of ΔGfo\Delta{G}_f^{o} of the sulphide is greater than those for CS2C{S}_{2} and H2S{H}_{2}S
  2. Bthe ΔGfo\Delta{G}_f^{o} is negative for roasting of sulphide ore to oxide
  3. Croasting of the sulphide to the oxide is thermodynamically feasible
  4. Dcarbon and hydrogen are suitable reducing agents for metal sulphides

Correct answer

D. carbon and hydrogen are suitable reducing agents for metal sulphides

Step-by-step solution

The standard free energies of formation (ΔGfo)\left(\Delta{G}_f^{o}\right) of most of the sulphides are greater than those of CS2andH2SC{S}_{2} and {H}_{2}S . Hence, neither carbon nor hydrogen can reduce metal sulphides to metal. The standard free energies of formation of oxides are much lower than those of SO2S{O}_{2} . Therefore, oxidation of metal sulphides to metal oxides is thermodynamically favourable. Hence sulphide ore is roasted to the oxide before reduction.
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