.
1
(b)
Role of Silica in extraction of copper. 1
(c)
in the
extraction of silver from a silver ore. 1
Answer:
(a)
Cryolite improves the electrical conductivity of the cell as alumina is a
poor conductor. 
It
lowers the melting point of the mixture about 1250K.
(b) Role of silica in extraction of copper is to
convert the impurity of Fe to slag.
(c) Role of 
in
extraction of silver from silver ore is to convert silver sulphide into soluble
complex, which can be further employed for hydro
metallurgy,
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