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Why is the extraction of copper from pyr...

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

A

copper (I) sulphide `(Cu_2S)`

B

sulphur dioxide `(SO_2)`

C

iron sulphide (FeS)

D

carbon monoxide (CO)

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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-EXERCISE
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  18. In the context of the Hall-Heroult process for the extraction of Al, ...

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