A. Electromagnetic separation
B. Froth floatation
C. Roasting
D. None of these
Related Mcqs:
- Ore concentration by froth floatation utilises the ______________ of ore particles ?
A. Density difference
B. Wetting characteristics
C. Terminal velocities
D. None of these - Roasting of metallurgical ores is done mainly to ___________________?
A. Dehydrate it
B. Sinter the ore
C. Remove CO2 & H2O
D. Remove arsenic & sulphur - ______________ is an ore of lead?
A. Quartz
B. Galena
C. Siderite
D. Chalcopyrite - ______________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace?
A. Bauxite
B. Limestone
C. Quartz
D. Manganese - Flux addition during smelting of ore is done to___________________?
A. Remove impurities/gangue
B. Enhance rate of reaction
C. Accelerate reduction of ore
D. Separate slag from metal - _______________ is used as a flux in the smelting of copper ore like chalcopyrite ?
A. Coke breeze
B. Lime powder
C. Silica/quartz
D. Dolomite - A mineral is termed as ‘ore’, if ____________________?
A. A metal can be economically extracted from it
B. It contains ≥ 40% metal
C. The metal present in it is costly
D. All A , B. and C. - Pig iron is produced by blast furnaces in India using mostly the iron ore named _______________?
A. Hematite
B. Magnetite
C. Siderite
D. Chalcopyrite - Chalcopyrite is the main ore of_________________?
A. Copper
B. Lead
C. Tin
D. Iron - Which of the following is not a pyrite ore ?
A. Celestite
B. Galena
C. Gypsum
D. Siderite
