SATHEE: General Principles and Processes of Isolation of Elements

General Principles and Processes of Isolation of Elements - Result Question 13

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

[2007]

(a) The $Δ G_{f}^{0}$ of the sulphide is greater than those for $C S_{2}$ and $H_{2} S$ .

(b) The $Δ G_{f}^{0}$ is negative for roasting of sulphide ore to oxide.

(d) Carbon and hydrogen are suitable reducing agents for metal sulphides.

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Solution:

(d) The sulphide ore is roasted to oxide before reduction because the $Δ G_{f}^{\circ}$ of most of the sulphides are greater than those of $C S_{2}$ and $H_{2} S$ , therefore, neither $C$ nor $H$ can reduce metal sulphide to metal. Further, the standard free energies of formation of oxide are much less than those of $S O_{2}$ . Hence, oxidation of metal sulphides to metal oxide is thermodynamically favourable.

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General Principles and Processes of Isolation of Elements - Result Question 13

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