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.
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 - Iron ore hematite is concentrated using ____________________?
A. Electromagnetic separation mainly
B. Gravity separation
C. Froth floatation
D. Roasting - Sulphur removal by heating of pyrite ore in presence of air is called its ____________________?
A. Reduction
B. Roasting
C. Calcination
D. Smelting - Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as ____________________ oil?
A. Drying
B. Semi-drying
C. Non-drying
D. None of these - 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 - 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 - ______________ 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 - Percentage of uranium in Carnotite ore found in Jadugoda (Jharkhand) is about ___________________?
A. 0.1 to 0.5
B. 1 to 5
C. 5 to 10
D. 15 to 25
