Chemical Engineering MCQs

Page No. 745

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


aControlling timber degradation by ants


bControlling poultry lice


cPotato beetle


dCitrus fruits


View Answer Citrus fruits

Penicillin is separated from fermented broth by ____________________?


aExtraction with amyl or butyl acetate


bTernary Azeotropic distillation


cEvaporator in calandria


dExtractive distillation



Carbon disulphide is mainly used in the production of______________________?


aViscose rayon


bCorundum


cPlasticiser for unsaturated polyester


dPaints


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


bWater forms an acid mist, which is difficult to absorb


cThe purity of acid is affected


dScale formation in the absorber is to be avoided



Teflon is___________________?


aPhenol formaldehyde


bAn inorganic polymer


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


dA monomer



Sea water contains about ______________________ ppm of bromine ?


a5


b70


c500


d1700


View Answer 70

Nitric acid is not used in the manufacture of______________________?


aDetergents


bFertilisers


cAqua regia


dExplosives


View Answer Detergents

Permanent hardness of water can be removed by___________________?


aBoiling


bAdding Ca(OH)2


cBoiling it with Na2CO3


dNone of these



Celluloid is chemically___________________?


aCellulose acetate


bRegenerated cellulose


cCellulose nitrate


dCellulose acetate butyrate


View Answer Cellulose nitrate

Plasticisers are added to synthetic plastics to____________________?


aImpart flexibility


bImprove workability during fabrication


cDevelop new improved properties not present in the original resins


dAll A, B. and C.


View Answer All A, B. and C.

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