Chemical Process - Chemical Engineering Questions and Answers

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Phosphoric acid is prepared from

cryolite

chalcopyrite

rock phosphate

none of these

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Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used

as a lubricant.

as a rust preventive.

in hard water for cleaning of cloth.

as a foam depressant in distillation column.

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Which of the following processes does not produce Cl₂ as a co-product during the manufacture of caustic soda ?

Diaphragm electrolytic cell process

Mercury electrolytic cell process

Lime-soda process

None of these

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Bleaching action of bleaching powder is due to its __________ properties.

reducing

oxidising

disinfecting

none of these

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Solvent extracted oil

has low free fatty acid content.

is odourless.

has more of unsaturates.

none of these.

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Which of the following is not required in the manufacture of soda ash by Solvay process ?

Ammonia

Limestone

Nitric acid

None of these

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Saponification number of an oil or fat

gives an idea about its molecular weight.

is inversely proportional to its molecular weight.

detects its adulteration.

all (a), (b) & (c).

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The purpose of tanning in leather industry is to

stiffen the leather.

smoothen the leather.

make it flexible.

impart water resistance.

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Lime and soda ash are added to water to remove

bicarbonates & sulphates of calcium and magnesium.

undersirable taste and odour.

bacteria.

its corrosiveness.