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JEE Main levelSingle correct optionDifficulty 2 of 3mt137

During smelting of roasted chalcopyrite with silica in a reverberatory furnace, iron is removed as

A $CaSiO X_{3}$ slag
Bmetallic iron in the matte
C $FeSiO X_{3}$ slag
D $Fe (OH) X_{2}$

Answer: C

Roasting converts part of

FeS

into

FeO

, which is an iron oxide that combines with silica:

FeO + SiO X_{2} FeSiO X_{3}

. The light slag floats on the matte of

Cu X_{2} S

and

FeS

.

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