In the extraction of copper from your mine, we are now in the roasting phase. Broadly, what will be the components of the product that you get out of the reverberatory furnace?

Cu₂O

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Cu₂S

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FeSiO₃

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FeS (minor) and FeO (major)

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Solution

The correct options are
B
Cu₂S

D
FeS (minor) and FeO (major)

In the roasting process

$2 C u F e S_{2} + O_{2} \to C u_{2} S + 2 F e S + S O_{2} 2 F e S + 3 O_{2} \to 2 F e O + 2 S O_{2} 2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$

But this is a minor side reaction since Fe has greater affinity for oxygen and hence the following happens:

$C u_{2} O + F e S \to C u_{2} S + F e O$

of $C u_{2} S$ and FeS only FeS is largely oxidized to FeO

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Q. Which of the following statements are incorrect?
I. Zinc can be extracted by self-reduction.
II. A depressant prevents a certain type of particles to come to the froth.
III. Copper matte contains

Z n S

and

C u_{2} S

.
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S O_{2}

during the extraction.

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