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Roasting results in the formation of oxides. But why are oxide ores are subjected to roasting?

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MCQs on metals occurrence, ores concentration, crude metal extraction, metallurgy thermodynamic and electrochemical principles, oxidation reduction, refining, aluminium, copper, zinc and iron uses.
 


Roasting results in the formation of oxides. But why are oxide ores are subjected to roasting?






 
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