Question

Which is not the correct statement?

• A. Cassiterite, chromite and pitchblende are concentrated by hydraulic washing (Tabling).
• B. Pure $A{l}_2{O}_3$ is obtained from the bauxite ore by leaching in the Baeyers 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 1

Answer: (C)

Sulphide ore is concentrated by calcination method

Sulphide ore is concentrated by froth flotation method. Galena ($PbS$), zinc blende ($ZnS$) and copper pyrites ($CuFe$$S_2$) are concentrated by this method.