Home Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) ORES & Method of Concentration Which is not correct statement ?
Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) ORES & Method of Concentration Single Correct MCQ
Published on: August 12, 2026

Which is not correct statement ?

A
Cassiterite, chromite and haematite may be concentrated by hydraulic washing (Tabling).
B
Pure Al 2 O 3 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.

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The correct answer is:
C

Sulphide ore is roasted in presence of excess of air or O 2 below its melting point to convert into the oxide and to remove the impurities of S, P, Sb etc., as their volatile oxides. In some cases roasting of certain sulphide ores provide directly the metals.

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