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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt160

Which statements about extraction of copper from chalcopyrite are correct?

Ain the converter, $Cu X_{2} S$ is reduced to copper by coke
Broasting removes part of the sulphur as $SO X_{2}$ and volatile oxides of As and Sb
Cthe matte obtained from the reverberatory furnace is mainly $Cu X_{2} S$ with $FeS$
Dsilica added during smelting slags iron oxide as $FeSiO X_{3}$

Answer: B, C, D

Roasting oxidises sulphur and volatile impurities, smelting with silica gives matte and

FeSiO X_{3}

slag, and the converter works by air oxidation and self-reduction of

Cu X_{2} S

and

Cu X_{2} O

, not by coke.

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