Chemical Engineering MCQs

Page No. 8

Phosphatic fertiliser is graded based on its _____________ content?


a P2O3


bPCl5


cP2O5


dH3PO4


View Answer P2O5

Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ______________ of the catalyst ?


aStabilisation


bIncreasing the effectiveness


cImproving the strength & heat resistance


dAll A, B & C


View Answer All A, B & C

Naphtha in a fertiliser plant is used as a source of___________________?


aFuel


bH2


c N2


dO2


View Answer H2

Low grade phosphate rock can be used in electrical furnace, because__________________?


a Of the better CaO/SiO2 balance for slag formation


bCaO content is less


cIt is cheap


dIt produces low cost product



Commercial production of hydrogen for the manufacture of nitrogenous fertilisers is done by________________?


aSteam reforming of naphtha and cracking of natural gas


bElectrolysis of water


cCryogenic separation of hydrogen from coke oven gas


dAll A., B. and C.


View Answer All A., B. and C.

Reaction of Cresylic acid with _____________ produces Tricresyl phosphate?


a Phosphorous pentoxide


bPhosphorous oxychloride


cAmmonium phosphate


dCalcium phosphate



Phosphorus vapour comprises of ___________________?


aP


bP2


cP3


dP4


View Answer P4

______________ is the most suitable fertiliser for paddy?


aUrea


bAmmonium sulphate


cSuperphosphate


dPotassium nitrate


View Answer Ammonium sulphate

A mixture of phosphate rock ______________ is heated in an electric furnace to produce phosphorous?


aSalt & coke


bSand & coke


cAnd coke


dAnd sand


View Answer Sand & coke

Urea is formed only____________________?


aIn liquid phase


bIn vapour phase


cAt very high temperature


dAt very low pressure (vacuum)


View Answer In liquid phase

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