Chemistry - Metallurgy Question with Solution | TestHub

(A) Sphalerite (ZnS): Self Reduction

Sphalerite is generally roasted to ZnO and then reduced by carbon; self-reduction is not used.

(B) Cerussite (PbCO₃): Roasting

Carbonate ores are usually calcined, not roasted.

(C) Rutile (TiO₂): Reduction by Al

Titanium dioxide can be reduced by aluminium in the aluminothermic process.

(D) Chalcopyrite (CuFeS₂): Froth Flotation

Being a sulphide ore, chalcopyrite is concentrated by the froth flotation method.

Answer: (C) and (D)