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(D) The standard free energies of formation $(\Delta G_f^o)$ of most metal sulphides are greater than those of $CS_2$ and $H_2S$. This means that carb

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Carbon and hydrogen are suitable reducing agents for metal sulphides.

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(D) The standard free energies of formation $(\Delta G_f^o)$ of most metal sulphides are greater than those of $CS_2$ and $H_2S$. This means that carbon and hydrogen cannot effectively reduce metal sulphides to their respective metals. However,the standard free energies of formation of metal oxides are significantly lower than those of $SO_2$. Therefore,the oxidation of metal sulphides to metal oxides is thermodynamically favourable. Thus,roasting the sulphide ore to an oxide before reduction is a necessary step in the extraction process. Consequently,the statement that carbon and hydrogen are suitable reducing agents for metal sulphides is false.

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

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