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The most abundant constituent in air is

A. hydrogen

B. nitrogen

C. oxygen

D. noble gases

Correct Answer :

B. nitrogen


Related Questions

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Which of the following metals is the best conductor of heat and electricity?

A. Aluminium

B. Silver

C. Copper

D. Magnesium

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Real gases tend to become ideal Under

A. low pressure and high temperature

B. low pressure and low temperature

C. high pressure and low temperature

D. high pressure and high temperature

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The hormone which absorption is increases glucose oxidation and glucose

A. adrenalin

B. thyroxin

C. insulin

D. epinephrine

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Which of the following carbon compounds is used as a fire extinguisher?

A. Carbon disulphide

B. Chloroform

C. Carbon tetrachloride

D. Methylene chloride

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Gasoline is obtained from crude petroleum by

A. fractional distillation

B. fractional crystallisation

C. sublimation

D. evaporation

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Which of the following represents a physical change?

A. sublimation

B. oxidation

C. reduction

D. decomposition

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The science which deals with the chemistry of life processes is known as

A. electrochemistry

B. physical chemistry

C. biochemistry

D. tinctorial chemistry

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The sugar which is used in silvering mirrors is

A. sucrose

B. maltose

C. glucose

D. fructose

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An antipyretic is a drug used

A. in the treatment of malaria

B. to relieve sleepiness

C. to induce sleep

D. to lower body temperature

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Graphite la a good conductor of electricity because

A. it is an allotrope of carbon

B. it gives CO2 on heating

C. it contains free electrons

D. it is oxidised to graphitic acid

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The kinetic energy of gas molecules

A. is unaffected by temperature variations

B. decreases with increase of temperature

C. increases with decrease of temperature

D. increases with increase of temperature

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The raw materials required for the manufacture of glass are

A. silica, sodium nitrate and soda ash

B. silica, limestone and sodium nitrate

C. silica, sodium oxide and limestone

D. silica, soda ash and limestone

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The atomic number of an element represents

A. number of neutrons in the nucleus

B. number of protons and neutrons in the nucleus

C. the valency of the element

D. number of protons in the nucleus

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The Long Form of the Periodic Table is based on

A. atomic number

B. valency

C. atomic mass

D. atomic radius

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Lunar caustic is

A. calcium sulphate

B. ammonium chloride

C. caustic soda

D. silver nitrate

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Carbogen is used in

A. CO2 poisoning

B. CO poisoning

C. phosgene poisoning

D. anesthesia

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Stainless steel contains steel and

A. manganese

B. vanadium

C. nickel

D. chromium

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BHC is a

A. Rodenticide

B. Herbicide

C. Pesticide

D. Fungicide

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Harmful bacteria in drinking water cannot be destroyed by

A. chlorination

B. boiling

C. adding caustic soda

D. ozonisation

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The commonest ore of aluminium is

A. cryolite

B. bauxite

C. malachite

D. azurite

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Which of the following types of water gives lather easily with soap?

A. Hard water

B. Heavy water

C. Soft water

D. Both (a) and (b)

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Soda-water contains

A. sodium bicarbonate

B. sodium carbonate

C. carbonic acid

D. sodium hydroxide

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Oxalic acid is used in the manufacture of

A. tincture iodine

B. paints

C. ink

D. aerated water

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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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The substance preserved under water is

A. potassium

B. sodium

C. red phosphorus

D. white phosphorus

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The Combined Gas Law equation is

A. P1V1T1 = P2 V2 T2

B. P1V1T2 = P2V2T1

C. P = P1 + P2 + P3

D. C =

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Which of the following is not a physical change?

A. Distillation of water

B. Action of heat on potassium chlorate

C. Powdering of glass

D. Burning of an electric lamp

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Phosgene is a compound of

A. red phosphorus and oxygen

B. white phosphorus and oxygen

C. carbon monoxide and chlorine

D. carbon dioxide and chlorine

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Compounds containing only carbon and hydrogen are called

A. carbohydrates

B. carbides

C. hydrocarbons

D. carbonyls

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Marsh gas is

A. ethane

B. ethylene

C. acetylene

D. methane