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An Intiative by Sri Chaitanya
a
Cassiterite, chromite and haematite are concentrated by hydraulic washing (Tabling).
b
Pure Al2O3 is obtained from the bauxite ore by leaching in the Bayer's process.
c
Sulphide ore is concentrated by calcination method.
d
Roasting can convert sulphide into oxide or sulphate and part of sulphide may also act as a reducing agent.
answer is C.
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