Q13 / 60 · KVPY 2011 (SA) · Chemistry
In the conversion of zinc ore to zinc metal, the process of roasting involves.
- A$\mathrm{ZnCO}_{3} \rightarrow \mathrm{ZnO}$
- B$\mathrm{ZnO} \rightarrow \mathrm{ZnSO}_{4}$
- Correct answerC$\mathrm{ZnS} \rightarrow \mathrm{ZnO}$
- D$\mathrm{ZnS} \rightarrow \mathrm{ZnSO}_{4}$
Solution
$2 \mathrm{ZnS}+3 \mathrm{O}_{2} \stackrel{950^{\circ} \mathrm{C}}{\longrightarrow} 2 \mathrm{ZnO}+2 \mathrm{SO}_{2}$
$\mathrm{ZnS}+2 \mathrm{O}_{2} \stackrel{950^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{ZnSO}_{4}$
then
$2 \mathrm{ZnSO}_{4} \stackrel{950^{\circ} \mathrm{C}}{\longrightarrow} 2 \mathrm{ZnO}+2 \mathrm{SO}_{2}+\mathrm{O}_{2}$
Hence, the correct answer is option: 'C'.