Answer:
(a)
[1]
(b) Silica is used as flux and removes oxide impurities as
CaO, MgO, FeO, in the form of and
If copper sulphide mineral is rich in FeO, it is treated with
flux and
heated in a reverberatary furnace. FeO is removed as slag. [1]
(c) The free energy change for the formation of is highly
negative thus no reducing agent is suitable for its reduction.
to
Thus, it is not feasible A] is obtained by electrolysis of
oxide. [1]
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