Answer:
The standard free
energy (
)
of Cu2S is more than those of CS2 and H2S.
Therefore Cu2S cannot be reduced by either coke or hydrogen.
These reactions are
not feasible. However, the 
of
is lower than that
of CO and hence carbon can easily reduce Cu2O to Cu.
Therefore, pyrite
is first roasted to Cu2O with is then reduced by using carbon.
It is because of
this reason that the extraction of copper from its pyurite is difficult than
that form its oxide through reduction.
You need to login to perform this action.
You will be redirected in
3 sec
