Chemical Engineering MCQs

Page No. 7

Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis ?


aH2 separation from coke oven gas


bSteam reforming of naphtha


cCracking of natural gas


dElectrolysis of water


View Answer Electrolysis of water

Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium___________________?


aCarbonate


bPhosphate


cBicarbonate


dSilicate


View Answer Carbonate

Montecatini process is used for the manufacture of____________________?


aNitric acid


bPhosphoric acid


cUrea


dCalcium ammonium nitrate (CAN)


View Answer Urea

Bio-fertilisers are cheaper, renewable and pollution free. They improve the _____________ of the soil?


aNutrient supply


bTexture


cWater holding capacity


dAll A., B. and C.


View Answer All A., B. and C.

Lower temperature and large excess of ammonia in urea melt__________________?


aIncreases biuret formation


b Decreases biuret formation


cIs undesirable


dDoes not effect biuret formation



Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of_________________?


aPhosphoric acid


bSuperphosphate


cPhosphorous


dTriple superphosphate


View Answer Phosphorous

The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about ____________ percent?


a60


b30


c95


d100


View Answer 60

Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of ____________ this is normally not done?


aIncreased biuret formation


bHigh corrosion rate


cIncreased cost of equipment


dAll A., B. & C.


View Answer All A., B. & C.

Which of the following is not a measure component necessarily to be present in fertilisers ?


aNitrogen


bPotassium


cPhosphorous


dSulphur


View Answer Sulphur

Fertiliser plants get their N2 requirements _____________________?


aBy fractionation of liquefied air


b By dissociating oxides of nitrogen


cFrom coal gas (coke oven gas)


dFrom producer gas



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