A. Crystallisation
B. Vacuum crystallisation
C. Atmospheric distillation
D. Dehydration
Related Mcqs:
- 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 sulphide ores is done usually by____________________?
A. Roasting
B. Smelting
C. Froth floatation
D. Electromagnetic separation - Hydrogen gas is not produced commercially (for nitrogenous fertiliser manufacture) by _____________________?
A. Iron-steam reaction
B. Electrolysis of water
C. Steam reforming of naphtha
D. Its cryogenic separation from coke oven gas - Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is __________________?
A. A slow reaction
B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
C. Still in development stage (by employing fluidised bed technique)
D. All A , B. and C - 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 - Separation of fresh water from sea water can be done by the _______________ operation ?
A. Osmosis
B. Reverse osmosis
C. Absorption
D. Adsorption - Calcination of limestone is not done in a ______________ kiln for producing lime ?
A. Vertical shaft
B. Rotary
C. Fluidised bed
D. Fixed bed - Electro deposition of metals i.e. electroplating is never done on_____________________?
A. Metals
B. Alloys
C. Refractories
D. Non-metals
