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Roasting of ores is done inA. Presence of an execess of air or oxygenB. Presence of superheated steamC. Absence of airD. Presence of a limited supply of air |
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Answer» Correct Answer - a Once n ore is concentrated, it may be neccessry to convent the mineral to a compound more suitable the reduction. Reasting is the process of heating a comecetrated ore below its melting point in the pressence of execes of air to obtain the oxide . Sulphide minerals such as zinc ore (containing the minerals aphalterite `ZnS` are usually roasted befor reducing them to the metal). `2ZnS(s) + 3O_(2)(g) overset (heat) To 2 ZnO(s) + 2SO_(2)(g)` `Delta H = - 684 kJ mol^(-1)` |
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