An acid which is used as a preservative for pickles is

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An acid which is used as a preservative for pickles is

A. hydrochloric acid

B. citric acid

C. tartaric acid

D. acetic acid

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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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Riboflavin deficiency causes

A. tongue inflammation

B. pellagra

C. night blindness

D. anaemia

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Which of the following is not a metal?

A. Lithium

B. Helium

C. Sodium

D. Cobalt

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Refined petroleum is decolourised by

A. manganese dioxide

B. bauxite

C. animal charcoal

D. quicklime

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Nylon is made from

A. terephthalic acid and ethylene glycol

B. hexamethylene diamine and adipic acid

C. cellulose nitrate

D. cellulose acetate

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The gas which has a faint sweet odour is

A. nitrogen

B. nitrous oxide

C. nitric oxide

D. nitrogen peroxide

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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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The carbon cycle ensures that

A. the percentage of carbon dioxide in air is kept almost constant

B. air always contains a constant proportion of oxygen

C. sufficient amounts of carbohydrates are produced

D. the process of photosynthesis proceeds smoothly

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A non-metal which is a good conductor or heat and electricity is

A. iodine

B. sulphur

C. graphite

D. phosphorus

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Which of the following represents a physical change?

A. sublimation

B. oxidation

C. reduction

D. decomposition

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Cholesterol is

A. a carbohydrate

B. a protein

C. a lipid

D. a hormone

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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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Dry Ice is

A. solid carbon dioxide

B. liquid oxygen

C. liquid hydrogen

D. liquid. Chlorine

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In the making of jewels, gold is usually mixed with

A. zinc

B. tin

C. copper

D. aluminium

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The ore of iron is

A. Dolomite

B. Magnetite

C. Bauxite

D. Anglesite

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Which of the following is not a food material?

A. silicate

B. protein

C. fat

D. carbohydrate

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The modern system of symbols was evolved by

A. Dalton

B. Cavendish

C. Avogadro

D. Berzelius

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Dust particles in the air of large industrial cities are removed by

A. Sedimentation

B. Electrophoresis

C. Tyndall effect

D. Brownian movement

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Rooms in places infected by plague are disinfected using

A. bleaching powder

B. iodoform

C. sulphur dioxide

D. chlorine

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Setting of cement is due to

A. hydration

B. dehydration

C. dialysis

D. osmosis

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Which one of the following is used in dry cleaning of garments?

A. asphalt

B. naphtha

C. diesel oil

D. lubricating oil

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Ascorbic acid is the chemical name for

A. Vitamin B6

B. Vitamin C

C. Vitamin K

D. Vitamin D

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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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The principle involved in dialysis, a treatment administered to patients with affected kidneys is

A. Cataphoresis

B. Osmosis

C. Dehydration

D. Diffusion

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Copper is purified by

A. poling

B. tempering

C. calcination

D. galvanising

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A metal which exhibits allotropy is

A. cobalt

B. tin

C. manganese

D. platinum

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Nitrous oxide used as anaesthetic is usually mixed with

A. ethyl alcohol

B. chloroform

C. oxygen

D. methyl alcohol

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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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Ethyl alcohol is

A. a deliquescent substance

B. an efflorescent substance

C. a hygroscopic substance

D. a dehydrating substance

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Temporary hardness is due to the presence of

A. calcium carbonate

B. calcium bicarbonate

C. magnesium sulphate

D. calcium sulphate

Discuss this answer

Accepted Answer

D. acetic acid

An acid which is used as a preservative for pickles is

Correct Answer :

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