Which is not the correct statement?....

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Which is not the correct statement?
P
(1) Cassiterite, chromite and haematite may be concentrated by hydraulic washing (Tabling).
(2) Pure \( \mathrm{Al}_{2} \mathrm{O}_{3} \) is obtained from the bauxite ore by leaching in the Bayer's process.
(3) Sulphide ore is concentrated by a calcination method.
(4) Roasting can convert sulphide into oxide or sulphate and part of sulphide may also act as a reducing agent.


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