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General Principles and Processes of Extraction of Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryGeneral Principles and Processes of Extraction of Elements2 Marks
Question
Write the principle for the extraction of copper from sulphide ore.
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Answer

Copper is extracted from its sulphide ore by the principal of auto-reduction. In it sulphide ore is roasted; during roasting some of the sulphide ore is converted into oxide forms. Which react with remaining sulphide ore to form copper.
$ 2Cu_{2}S+3O_{2}\rightarrow 2Cu_{2}O+ 2SO_{2} $
$ Cu_{2}S+2Cu_{2}O\longrightarrow 6Cu+SO_{2} $

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