Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting (b) hydrogenation (c) chlorination (d) calcination

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Solution

(a) roasting
Zinc blende (zinc sulphide or ZnS) is a sulphide ore of zinc. Sulphide ores are converted to metal oxides by roasting (heating in the presence of air). When zinc blende is heated in the presence of surplus air, it is converted into zinc oxide.

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Calamine ore can be converted into zince oxide by the process of:
(a) roasting (b) hydrogenation (c) chlorination (d) calcination

Question 55
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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