A. Roasting
B. Smelting
C. Froth floatation
D. Electromagnetic separation
Related Mcqs:
- Roasting of metallurgical ores is done mainly to ___________________?
A. Dehydrate it
B. Sinter the ore
C. Remove CO2 & H2O
D. Remove arsenic & sulphur - At very high concentration of enzymes, the rate of fermentation chemical reaction is _____________ the concentration of reactants?
A. Independent of
B. Directly proportional to
C. Inversely proportional to
D. Proportional to the square of - Concentration of hydrogen peroxide is done by_____________________?
A. Crystallisation
B. Vacuum crystallisation
C. Atmospheric distillation
D. Dehydration - Permanent hardness of water can be removed by____________________?
A. Simply boiling
B. Adding alum
C. Passing it through cation & anion exchangers
D. All (A), B. and (C) - Glauber’s salt is chemically represented by____________________?
A. Na2SO4.10H2O
B. CaCl(OCl)
C. CaSO4.H2O
D. (NH4)2SO4 - Concentration of NaOH solution produced by diaphragm electrolytic cell is about _______________ percent?
A. 10
B. 25
C. 50
D. 98 - Ore concentration by froth floatation utilises the ______________ of ore particles ?
A. Density difference
B. Wetting characteristics
C. Terminal velocities
D. None of these - Concentration of NaOH solution produced by mercury electrolytic cell is about _______________ percent?
A. 10
B. 25
C. 50
D. 98 - 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 - Separation of fresh water from sea water can be done by the _______________ operation ?
A. Osmosis
B. Reverse osmosis
C. Absorption
D. Adsorption
