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  • Roasting is carried out to: A. Convert sulphide to metal oxides and SO2  B. Melt the ore C. Remove arsenic and sulphur impurities<div class='qna-op

Roasting is carried out to:

A. Convert sulphide to metal oxides and SO2 

B. Melt the ore

C. Remove arsenic and sulphur impurities

Option: 1

A only


Option: 2

B only


Option: 3

A and C only


Option: 4

A and B only


Answers (1)

best_answer

Roasting is the process in which concentrated ore is heated to high temperatures in presence of excess of air. It will convert sulphides to metal oxides and \mathrm{SO_{2}} and remove arsenic and sulphur impurities and water of hydration. Eg

\begin{aligned} & 2 \mathrm{Cu}_2 \mathrm{~S}(\mathrm{~s})+3 \mathrm{O}_2+\text { Heat } \rightarrow 2 \mathrm{Cu}_2 \mathrm{O}(\mathrm{s})+2 \mathrm{SO}_2(\mathrm{~g}) \\ \\& 2 \mathrm{ZnS}(\mathrm{s})+3 \mathrm{O}_2+\text { Heat } \rightarrow 2 \mathrm{ZnO}(\mathrm{s})+2 \mathrm{SO}_2(\mathrm{~g}) \\ \\& 2 \mathrm{PbS}(\mathrm{s})+3 \mathrm{O}_2+\text { Heat } \rightarrow 2 \mathrm{PbO}(\mathrm{s})+2 \mathrm{SO}_2(\mathrm{~g}) \end{aligned}

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