Common salt is generally not produced commonly by __________ method from brine.
Freeze drying
Electrolytic
Solar evaporation
Vacuum evaporation
Correct Answer :
A. Freeze drying
Related Questions
The drug used in contraceptives is
Sulfadiazine
Mestranol
Methyl salicylate
Penicillin
Pick out the wrong statement.
Strongly caking coal should not be used in the Lurgi gasifier
Acetylene gas cannot be used for illumination purpose
Water gas is called blue gas because of the color of the flame, when it is burnt
Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels
Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.
Phthalic anhydride
Vinyl chloride
Maleic anhydride
Dacron
Flux addition during smelting of ore is done to
Remove impurities/gangue
Enhance rate of reaction
Accelerate reduction of ore
Separate slag from metal
BHC (Benzene hexachloride) is made by the chlorination of benzene
Which is an addition reaction
Which is a substitution reaction
In absolute dark
In presence of sunlight
Hydrogen gas is not produced commercially (for nitrogenous fertiliser manufacture) by
Iron-steam reaction
Electrolysis of water
Steam reforming of naphtha
Its cryogenic separation from coke oven gas
In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because
SO3 gas is sparingly soluble in water
Water forms an acid mist, which is difficult to absorb
The purity of acid is affected
Scale formation in the absorber is to be avoided
In sulphate pulp manufacture, the pressure and temperature in the digestor is
10 atm., 800 °C
10 atm., 170-180°C
1 atm., 170 - 180°C
1 atm., 800°C
Fire clay is __________ refractory material.
A basic
An acidic
A neutral
Not a
Vulcanisation of rubber
Decreases its tensile strength
Increases its ozone & oxygen reactivity
Increases its oil & solvent resistance
Converts its plasticity into elasticity
Sodium bisulphite is used for __________ water.
Deaeration
Dechlorination
Both (A) & (B)
Neither (A) nor (B)
Glycerine is recovered from lye by
Evaporation followed by vacuum distillation
Liquid extraction technique
Extractive distillation technique
None of these
Molasses is the starting material for the production of
Alcohol
Essential oil
Fatty acids
Massecuite
The process used for the manufacture of ethyl alcohol from molasses is
Distillation
Dehydration
Dehydrogenation
None of these
Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?
AgO
Al2O3
ZnCl2
Fe2O3
Digestion of wood-base materials (for manufacture of pulp) is done to
Remove lignin
Produce long fibres
Prevent deterioration on storage
None of these
DDT stands for
Diethyl-diphenyl-trichloromethane
Dichloro-diphenyl-trichloromethane
diphenyl-dichloro-trichloromethane
Dichloro-diphenyl-trichloroethane
Hydrogenation of oil does not
Remove double bonds
Raise its melting point
Improve its resistance to oxidation
None of these
Inversion of sucrose produces
Fructose
Glucose
Both (A) & (B)
Neither (A) nor (B)
__________ iron is the purest form of iron.
Cast
Wrought
Pig
High silicon
How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
500°C
750°C
1000°C
1500°C
Poly Vinyl Chloride (P.V.C.) is a __________ material.
Thermosetting
Thermoplastic
Fibrous
Chemically active
Presence of H2S in raw water (to be chlorinated) results in the
Reduced softening capacity of zeolite
Increased dosage of chlorine to provide a disinfecting residual in the water
Easy removal of its hardness
None of these
Hydrogenation of edible vegetable oils
Is an exothermic reaction
Increases their melting point
Is done in presence of nickel catalyst
All (A), (B) and (C)
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
L.D. converter
Blast furnace
Rotary kiln
Recuperator
Alcohol is produced by the
Oxidation of an aldehyde
Hydrolysis of an ether
Esterification of a fat
None of these
Soap cannot be used with hard water, because
Hard water contains sulphate
They form insoluble calcium soaps which precipitate
They attract back the removed dirt
None of these
Alkylbenzene sulfonate (ABS) is a
Detergent
Rubber
Pesticide
Polyester
Fusel oil is a/an
Essential oil
Extract from medicinal herbs
Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
None of these
Oxidation of SO2 to SO3 is favoured by
Low temperature and low pressure
Low temperature and high pressure
High temperature and low pressure
High temperature and high pressure