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4

In the common soda-acid fire extinguisher, the fire is put out by

A. acid fumes

B. sodium bicarbonate

C. carbon dioxide

D. sodium carbonate

Correct Answer :

C. carbon dioxide


Related Questions

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4

Proteins are polymerisation products of

A. aldehydes

B. alkenes

C. amino acids

D. alkynes

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4

Water has an unusually high bolling point because

A. its molecular weight is low

B. it is denser than ice

C. it is a good solvent for many ionic substances

D. the molecules of water are joined by hydrogen bonds

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4

Reduction involves

A. loss of electrons

B. gain of electrons

C. gain of oxygen

D. removal of hydrogen

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4

The pure at form of iron is

A. wrought iron

B. steel

C. pig iron

D. nickel steel

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4

The main constituent of gobar gas is

A. methane

B. nitrogen

C. carbondioxide

D. ethylene

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4

Lead soaps are used in

A. shaving creams

B. adhesive tapes

C. toilet powders

D. lubricants

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4

Cinnabar is an ore of

A. lead

B. zinc

C. mercury

D. chromium

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4

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 discoverer of chloroform was

A. Liebig

B. Pasteur

C. Bunsen

D. Erlenmeyer

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4

In the nitrogen cycle, denitrifying bacteria

A. oxidise ammonia to nitrates

B. convert nitrogen into ammonia

C. oxidise ammonia to free nitrogen

D. oxidise ammonia to oxides of nitrogen

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4

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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4

The gas which has a faint sweet odour is

A. nitrogen

B. nitrous oxide

C. nitric oxide

D. nitrogen peroxide

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4

Radium was isolated from

A. galena

B. dolomite

C. sylvine

D. pitchblende

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4

Carbogen is used in

A. CO2 poisoning

B. CO poisoning

C. phosgene poisoning

D. anesthesia

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4

Lead pencils contain

A. white lead

B. graphite

C. red lead

D. coke

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4

Rayon la made from

A. cotton

B. wool

C. cellulose

D. silk

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4

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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4

Which of the following is not a food material?

A. silicate

B. protein

C. fat

D. carbohydrate

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4

Diamonds are weighed in

A. grams

B. pounds

C. carats

D. tons

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Which of the following is a mixture?

A. Baking soda

B. Milk

C. Chloroform

D. Copper wire

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4

Marble is

A. calcium carbonate

B. sodium carbonate

C. magnesium sulphate

D. ferric chloride

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4

The substance most abundantly found in sea water is

A. magnesium chloride

B. sodium chloride

C. calcium sulphate

D. potassium chloride

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4

In the common soda-acid fire extinguisher, the fire is put out by

A. acid fumes

B. sodium bicarbonate

C. carbon dioxide

D. sodium carbonate

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4

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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4

Refined petroleum is decolourised by

A. manganese dioxide

B. bauxite

C. animal charcoal

D. quicklime

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4

________ is left behind after distillation of petroleum.

A. Arsenic

B. Barium

C. Benzene

D. Bitumen

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4

An example of stimulant fertilizer is

A. gypsum

B. urea

C. potassium nitrate

D. ammonium phosphate

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4

Acute diabetes patients smell of

A. acetone

B. ether

C. ethyl alcohol

D. methyl alcohol

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4

Which of the following is used in fuel to propel rockets?

A. Petrol

B. Kerosene

C. Hydrazine

D. Alcohol

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4

Temporary hardness is due to the presence of

A. calcium carbonate

B. calcium bicarbonate

C. magnesium sulphate

D. calcium sulphate