Exams › JEE Advanced › Chemistry
When zinc blende (ZnS) ore is roasted at a temperature above 850 degree C, the products formed are:
- ZnS and ZnSO4
- CO2 and ZnO
- SO2 and ZnO
- Zn and SO2
Correct answer: SO2 and ZnO
Solution
When zinc blende (ZnS) is roasted in air above 850 degree C, the sulphide is oxidised: 2ZnS + 3O2 -> 2ZnO + 2SO2. ZnO is further reduced to Zn metal in subsequent steps.
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