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4

A mixture of naphthalene and sand is separated by

A. evaporation

B. using a magnet

C. sublimation

D. sedimentation

Correct Answer :

C. sublimation


Related Questions

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The depletion of the ozone layer in the upper atmosphere is due to -extensive use of

A. dichloro-phenoxy-acetic acid

B. superphosphate of lime

C. chlorofluorocarbons (CFC)

D. dichloro-diphenyl-trichloro-ethane

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4

Proteins are polymerisation products of

A. aldehydes

B. alkenes

C. amino acids

D. alkynes

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Leakage in Liquefied Petroleum Gas (LPG) cylinders is easily detected by adding

A. mercaptans

B. propylene

C. carbon disulphide

D. phosgene

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4

The compound or nitrogen used in dry cells is

A. ammonia

B. ammonium nitrate

C. ammonium chloride

D. ammonium nitrite

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Which of the following is not a supporter of combustion?

A. Oxygen

B. Air

C. Hydrogen

D. Chlorine

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Galvanising is the process of coating

A. iron with zinc

B. zinc with iron

C. copper with silver

D. silver with gold

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Glass articles are annealed so that

A. they may appear better

B. they can resist the action of acids and alkalies

C. they lose their brittleness

D. they can withstand temperature shocks

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4

The value of Avogadro Number is

A. 6.023 x 1022

B. 1 x 10-14

C. cl 6.056 x 10-6

D. 6.023 x 1023

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4

Which of the following is used as an illuminant?

A. Gasoline

B. Benzoline

C. Kerosene

D. Petroleum ether

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What is 'oxygen mixture'?

A. A mixture of potassium nitrate and carbon

B. A mixture of ammonium chloride and sodium nitrate

C. A mixture of potassium chlorate and manganese dioxide

D. A mixture of ammonium nitrate and charcoal

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The gas evolved when ammonium nitrate is heated is

A. nitrogen

B. nitric oxide

C. nitrogen peroxide

D. nitrous oxide

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4

Flint glass contains

A. potassium and lead silicates

B. zinc and barium borosilicates

C. potassium and calcium silicates

D. sodium and calcium silicates

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4

Which of the following process involves removal of the elements of water?

A. Hydrolysis

B. Hydrogenation

C. Dehydration

D. Dehydrogenation

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4

Gasoline is obtained from crude petroleum by

A. fractional distillation

B. fractional crystallisation

C. sublimation

D. evaporation

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4

The presence of dust particles in air serves

A. as a nucleus to condense water vapour resulting in rain

B. to maintain the average density of air

C. to minimise the inflammatory nature of oxygen

D. to protect the inhabitants of the earth from the effects of ultra violet rays.

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4

Tincture iodine is

A. a disinfectant

B. an analgesic

C. a hypnotic

D. a dye

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The simplest hydrocarbon is

A. benzene

B. methane

C. ethane

D. butane

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The discoverer of chloroform was

A. Liebig

B. Pasteur

C. Bunsen

D. Erlenmeyer

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Which one of the following is not radioactive?

A. Astatine

B. Francium

C. Tritium

D. Zirconium

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4

Washing soda is

A. sodium hydroxide

B. sodium carbonate

C. sodium bicarbonate

D. potassium chloride

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Carbogen is used in

A. CO2 poisoning

B. CO poisoning

C. phosgene poisoning

D. anesthesia

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Laughing gas is

A. nitric oxide

B. nitrogen peroxide

C. nitrogen pentoxide

D. nitrous oxide

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4

Acute diabetes patients smell of

A. acetone

B. ether

C. ethyl alcohol

D. methyl alcohol

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A hormone which contains iodine is

A. adrenalin

B. glucagon

C. epinephrin

D. thyroxin

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CAN is used as (Calcium Ammonium Nitrate)

A. an explosive

B. a fertilizer

C. a dye

D. a bleaching agent

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4

The percentage of silver in German silver is

A. ten

B. twenty

C. zero

D. fifty

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4

A mixture of naphthalene and sand is separated by

A. evaporation

B. using a magnet

C. sublimation

D. sedimentation

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4

The compound used in photography is

A. ammonium dichromate

B. copper Sulphate

C. magnesium Sulphate

D. sodium thiosulphate

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4

Cinnabar is an ore of

A. lead

B. zinc

C. mercury

D. chromium

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Petroleum ether is also known as

A. kerosene

B. naphtha

C. lubricating oil

D. asphalt