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  • Give the reaction involved during extraction of zinc from its ore by (a) roasting of zinc ore (b) calcination of zinc ore

Give the reaction involved during extraction of zinc from its ore by
(a) roasting of zinc ore
(b) calcination of zinc ore

Answers (1)

Roasting: method by which a sulphide ore is converted into oxide
Calcination: method by which a carbonate ore is converted into oxide
(a) Roasting of zinc ore: Sulphide ore of zinc is ZnS (zinc blende)
2ZnS\left ( s \right )+3O_{2}\rightarrow 2ZnO\left ( s \right )+2SO_{2}
ZnO is then reduced to zinc by heating with coke (carbon)
ZnO\left ( s \right )+C\left ( s \right )\rightarrow Zn\left ( s \right )+CO\left ( g \right )
(b) Calcination of zinc ore: Carbonate ore of Zinc is calamine ZnCO3
ZnCO_{3}\left ( s \right )\rightarrow ZnO\left ( s \right )+CO_{2}\left ( g \right )
ZnO is then reduced to zinc by heating with coke (carbon)
ZnO\left ( s \right )+C\left ( s \right )\rightarrow Zn\left ( s \right )+CO\left ( g \right )

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