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  • Which among the following reaction represents a roasting method?  Option: 1 <img alt="2 \mathrm{Cu}_2 \mathrm{~S}(\mathrm{~s})+3 \math

Which among the following reaction represents a roasting method?

 

Option: 1

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})


Option: 2

2 \mathrm{ZnS}(\mathrm{s})+3 \mathrm{O}_2+\text { Heat } \rightarrow 2 \mathrm{ZnO}(\mathrm{s})+2 \mathrm{SO}_2(\mathrm{~g})


Option: 3

2 \mathrm{PbS}(\mathrm{s})+3 \mathrm{O}_2+\text { Heat } \rightarrow 2 \mathrm{PbO}(\mathrm{s})+2 \mathrm{SO}_2(\mathrm{~g})


Option: 4

All of the above


Answers (1)

best_answer

In isolation of metal, conversion of ore to oxide is done by calcination or roasting method. 

In calcination, the ore is heated at high temperature in absence of air/limited supply of air. Calcination is used to convert carbonated ores into oxide ores and hydrated ores are converted to anhydrous oxide. 

In roasting, the concentrated ore is heated at high temperature below the melting point of the metal in excess of air. This reaction occurs in reverberatory furnace. Usually, metal sulphides easily get converted to metal oxides by roasting.

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sudhir kumar

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