The main element used in the vulcani-sation of rubber is

Question

The main element used in the vulcani-sation of rubber is

A. nickel

B. copper

C. sulphur

D. graphite

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Colour blindness is

A. a congenital disease

B. a communicable disease

C. an acquired disease

D. a contagious disease

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The freezing point of water at 760 mm pressure is

A. 273 K

B. 0 K

C. 273°C

D. -273°C

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

A. Hydrolysis

B. Hydrogenation

C. Dehydration

D. Dehydrogenation

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Two or more entirely different compounds having the same molecular formula are known as

A. isobars

B. isotopes

C. isomorphs

D. isomers

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________ is left behind after distillation of petroleum.

A. Arsenic

B. Barium

C. Benzene

D. Bitumen

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The process that takes place in the atom bomb is

A. nuclear' fusion

B. radioactive disintegration

C. nuclear fission

D. chemical decomposition

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Rusting is a special case of corrosion applied to

A. nickel

B. tin

C. iron

D. chromium

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The fertilizer which has the largest percentage of nitrogen is

A. urea

B. ammonium nitrate

C. ammonium sulphate

D. calcium cyanamide

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A metal which is extracted by thermal reduction is

A. nickel

B. aluminium

C. mercury

D. calcium

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A metal which occurs 'free' in nature is

A. gold

B. zinc

C. tin

D. molybdenum

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The earliest name given to nitrogen was

A. dephlogisticated air

B. azote

C. inflammable air

D. marine acid air

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A mixture of ethyl alcohol and water can be separated by

A. evaporation

B. sublimation

C. using a separating funnel

D. fractional distillation

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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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Heavy water was discovered by

A. TW Richards

B. FW Aston

C. Stas

D. Urey

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Annealing of glass is carried out by

A. rapid cooling

B. rapid heating

C. slow cooling

D. slow heating

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Which of the following cannot be used for the preparation of soap?

A. oleic acid

B. acetic acid

C. palmitic acid

D. stearic acid

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Methylated spirit is a mixture of

A. methyl alcohol and acetic acid

B. methyl alcohol and ethyl alcohol

C. ethyl alcohol and pyridine

D. methyl alcohol and pyridine

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Coke is a substance obtained

A. from coal mines

B. when wood is burnt in excess of air

C. by heating coal out of contact with air

D. by heating wood out to contact with air

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Carbogen is used in

A. CO2 poisoning

B. CO poisoning

C. phosgene poisoning

D. anesthesia

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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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Iron is coated with zinc to prevent rusting. The process is called

A. annealing

B. tempering

C. calcining

D. galvanising

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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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Compounds of nitrogen with metals are called

A. nitrates

B. nitrites

C. hyponitrates

D. nitrides

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Soda-water contains

A. sodium bicarbonate

B. sodium carbonate

C. carbonic acid

D. sodium hydroxide

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Petroleum ether is also known as

A. kerosene

B. naphtha

C. lubricating oil

D. asphalt

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Diamonds are weighed in

A. grams

B. pounds

C. carats

D. tons

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Marsh gas is

A. ethane

B. ethylene

C. acetylene

D. methane

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The best specimen for drinking purposes is

A. rain water

B. river water

C. conductivity water

D. deep well water

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The formula for cane sugar is

A. C6H12O6

B. C2H5OH

C. C12H22O11

D. C7H8O

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Accepted Answer

C. sulphur

The main element used in the vulcani-sation of rubber is

Correct Answer :

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