(a) Name an ore of zinc.
(b) Which process is applied to concentrate it?
(c) How concentrated ore is changed to oxide?

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Solution

(a) Ore of zinc is zinc blende (ZnS).
(b) It is concentrated by Froth floatation process.
(c) Concentrated ore is changed into oxide by heating ZnS in excess of air.

$2 Z n S + 3 O_{2} 800^{\circ} C \to 2 Z n O + 2 S O_{2}$

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