Chemical Engineering MCQs

Page No. 745

Hydrocyanic acid (HCN) is used as an insecticide for____________________?


aControlling timber degradation by ants

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bControlling poultry lice

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cPotato beetle

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dCitrus fruits

✓


View Answer Citrus fruits

Penicillin is separated from fermented broth by ____________________?


aExtraction with amyl or butyl acetate

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bTernary Azeotropic distillation

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cEvaporator in calandria

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dExtractive distillation

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Carbon disulphide is mainly used in the production of______________________?


aViscose rayon

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bCorundum

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cPlasticiser for unsaturated polyester

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dPaints

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View Answer Viscose rayon

In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because___________________?


aSO3 gas is sparingly soluble in water

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bWater forms an acid mist, which is difficult to absorb

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cThe purity of acid is affected

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dScale formation in the absorber is to be avoided

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Teflon is___________________?


aPhenol formaldehyde

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bAn inorganic polymer

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cPoly tetra-fluoro-ethylene (P.T.F.E.)

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dA monomer

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Sea water contains about ______________________ ppm of bromine ?


a5

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b70

✓


c500

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d1700

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View Answer 70

Nitric acid is not used in the manufacture of______________________?


aDetergents

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bFertilisers

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cAqua regia

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dExplosives

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View Answer Detergents

Permanent hardness of water can be removed by___________________?


aBoiling

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bAdding Ca(OH)2

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cBoiling it with Na2CO3

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dNone of these

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Celluloid is chemically___________________?


aCellulose acetate

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bRegenerated cellulose

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cCellulose nitrate

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dCellulose acetate butyrate

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View Answer Cellulose nitrate

Plasticisers are added to synthetic plastics to____________________?


aImpart flexibility

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bImprove workability during fabrication

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cDevelop new improved properties not present in the original resins

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dAll A, B. and C.

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View Answer All A, B. and C.

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