1. Magnetic process can be used for:
(A) Non ferrous metals
(B) Ferrous metals
(C) Non metals
(D) None of these
2. The process in which iron sulphide is converted into iron oxide is called:
(A) Smelting
(B) Roasting
(C) Refining
(D) None of these
3. Process in which some minerals are converted to oxide by heating in air at temperature below their melting point is called:
(A) Bessemerization
(B) Smelting
(C) Roasting
(D) Concentration
4. In froth floatation bubbles are produced by:
(A) Oxygen
(B) Air
(C) Nitrogen
(D) CO
5. In calcination process ______ gas is evolved:
(A) SO₂
(B) Nitrogen
(C) CO₂
(D) SO₃