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4

Good quality of edible salt is obtained from brine by the process of

A. Solar evaporation

B. Vacuum evaporation

C. Freeze drying

D. Electrolysis

Correct Answer :

B. Vacuum evaporation


Related Questions

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4

Pick out the wrong statement.

A. Pasteurisation of milk involves moderate heating followed by cooling

B. Bakeries and breweries make use of yeasts

C. Enzyme is a complex nitrogenous compound

D. Oils and fats are alkaloids

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4

Alum is commercially produced from

A. Gypsum

B. Feldspar

C. Galena

D. Bauxite

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4

Starting material for the commercial production of ethyl alcohol in India is

A. Rice

B. Molasses

C. Fruit of Mahua tree

D. Maize

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4

Blue colour is imparted to glass by the addition of

A. FeSO4

B. PbO

C. CaO

D. NaOH

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4

Polycaprolactam is commercially known as

A. Nylon-6

B. Nylon-66

C. Dacron

D. Rayon

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4

DDT should not be allowed to come in contact with iron (during its manufacture) to

A. Avoid its decomposition

B. Prevent sulphonation of the monochlorobenzene by the acid catalyst

C. Achieve non-hygroscopic property

D. None of these

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4

Refractory bricks having high thermal conductivity is desirable, when it is to be used in the

A. L.D. converter

B. Blast furnace

C. Rotary kiln

D. Recuperator

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4

Acetone is produced by catalytic dehydrogenation of

A. Phenol

B. Naphthalene

C. Isopropanol

D. Ethyl benzene

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4

Sulphur removal by heating of pyrite ore in presence of air is called its

A. Reduction

B. Roasting

C. Calcination

D. Smelting

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4

__________ is not a constituent of gun powder.

A. Carbon

B. Charcoal

C. Sulphur

D. Potassium nitrate

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4

Celluloid is chemically

A. Cellulose acetate

B. Regenerated cellulose

C. Cellulose nitrate

D. Cellulose acetate butyrate

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4

Wet chlorine gas produced during electrolysis of brine is dehydrated by

A. Spraying 66° Be H2SO4 counter current to the flow of the gas

B. Passing it through a bed of diatomaceous earth

C. Passing it through a bed of silica gel

D. None of these

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4

Naphthalene is removed from coke oven gas by

A. Adsorbing on palladium

B. Absorbing in ethanolamine

C. Scrubbing with wash oil

D. Passing it through electrostatic precipitator

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4

Phosphate rock is a raw material for the manufacture of

A. Phosphoric acid

B. Phosphorous

C. Superphosphates

D. All (A), (B) and (C)

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4

Conversion of CO to CO2 by steam in presence of a catalyst is called

A. Steam reforming

B. Shift conversion

C. Steam gasification

D. None of these

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4

Phenol formaldehyde is produced by condensation polymerisation. It is also known as

A. Teflon

B. Bakelite

C. Polyester

D. Nylon-66

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4

Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.

A. -83

B. -183

C. -196

D. -218

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4

Fermentation of molasses to produce ethyl alcohol is done at __________ °C.

A. 20 - 30

B. < - 5

C. 100 - 150

D. 250 - 300

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4

Which one of the following is not likely to be a constituent of vegetable oils?

A. Citric acid

B. Oleic acid

C. Stearic acid

D. Glycerol

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4

RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically

A. Cyclo trimethylene trinitramine

B. Trinitro resorcinol

C. Cyclo tetramethylene tetranitramine

D. Trinitrobenzene

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4

For the hydrogenation of oils, __________ (i) __________ is commonly used as catalyst and __________ (ii) __________ is a catalyst poison.

A. (i) platinum (ii) sulphur

B. (i) palladium (ii) oxygen

C. (i) nickel (ii) sulphur

D. (i) nickel (ii) oxygen

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4

Concentration of hydrogen peroxide is done by

A. Crystallisation

B. Vacuum crystallisation

C. Atmospheric distillation

D. Dehydration

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4

Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.

A. 7-14 and 14-30

B. 7-14 and 40-50

C. 14 - 30 and 40-50

D. 10 - 20 and 40 - 50

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4

__________ process is used for the manufacture of sodium carbonate by ammonia soda process.

A. Ostwald's

B. Bosch

C. Solvay

D. Haber's

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4

Extraction of __________ employs an electrolytic process.

A. Aluminium

B. Silver

C. Copper

D. All (A), (B) and (C)

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4

Drinking (potable) water treatment does not involve

A. Coagulation

B. Sedimentation

C. Softening

D. Disinfection

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4

DDT stands for

A. Diethyl-diphenyl-trichloromethane

B. Dichloro-diphenyl-trichloromethane

C. diphenyl-dichloro-trichloromethane

D. Dichloro-diphenyl-trichloroethane

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4

Salt is added in the kettle during soap manufacture to separate

A. Soap from lye

B. Glycerine from lye

C. The metallic soap

D. The unsaponified fat from soap

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4

Chemical name of 'alum' is

A. Barium sulphate

B. Aluminium sulphate

C. Aluminium chloride

D. Calcium sulphate

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4

Glauber's salt is chemically

A. Calcium sulphate

B. Potassium sulphate

C. Potassium chlorate

D. None of these