A) Cassiterite, chromite and pitchblende are concentrated by hydraulic washing (Tabling).
B) Pure \[Al{{O}_{2}}\] is obtained from the bauxite ore by leaching in the Baeyer'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.
Correct Answer: C
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