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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.

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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. 
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(a) Roasting : `2ZnS (s) + 3O_(2)(g) overset("heat")rarr2ZnO(s) + 2SO_(2)(g)`.
(b) Calcination : `ZnCO_(3)(s) overset("heat")rarrZnO(s) + CO_(2)(g)`
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