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  4. A sulphide ore like ZnS is first roasted into its oxide prior to reduction by carbon because:

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Q. A sulphide ore like ZnS is first roasted into its oxide prior to reduction by carbon because:

General Principles and Processes of Isolation of Elements

Solution:

The Gibbs free energy of most sulphides are greater than that for $CS_{2}$. In fact, $CS_{2}$ is an endothermic compound. Therefore, the $\Delta _fG^o$ of MJS is not compensated. So reduction of $M_{x}S$ is difficult. Hence it is common practice to roast sulphide ores to corresponding oxides prior to reduction.