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Problem
Roasting of copper pyrites is done : a. to remove moisture and volatile impurities b. to oxidise free sulphur c. to decompose pyrites into
Cu
2
S
\text{Cu}_2\text{S}
Cu
2
S
and
FeS
\text{FeS}
FeS
d. to decompose
Cu
2
S
\text{Cu}_2\text{S}
Cu
2
S
into blister copper
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