Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Which reaction does not occur in roasting process.
A
HgS + 2HgO 
3Hg + SO 2
3Hg + SO 2
B
PbS + 2PbO 
3Pb + SO 2
3Pb + SO 2
C
ZnS + 2ZnO 
3Zn + SO 2
3Zn + SO 2
D
None of mese
Text Solution
Verified by ExpertsThe correct answer is:
C
ZnS + 2ZnO 
3Zn + SO 2
On roasting HgS and PbS sulphides ores are partly converted into their respective oxides. Since the oxides of Hg and Pb are unstable. While that of zinc is stable, therefore, oxides of Hg and Pb bring about the reduction of their sulphides to metals, but zinc oxides does not reduce ZnS to Zn metal
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