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Explain the role of coke and sand added during smelting process in the extraction of copper.

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Answer Text

Solution :
Coke is the sourece of heat in smelting and also it acts as reducing agent, which reduces `Cu_(2)O"to"Cu`: <br> `Cu_(2)O+Cto2Cu+CO` <br> `SiO_(2)` combines with the impurities like FeO and is removed as slag: <br> `FeO+SiO_(2)toFeSiO_(3)`

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