Chemical Engineering MCQs

Page No. 47

pick out the wrong statement?


aDehydration of ammonium carbamate to produce urea is endothermic


bDirect use of liquid ammonia as a fertiliser for a tropical country like India is suitable


cGypsum (CaSO4. 2H2O) is obtained as a by-product in the wet process for manufacture of ortho-phosphoric acid


d Phosphate rock when reacted with dilute H2SO4 produces superphosphate



Threshold limit value (TLV) of CO in air is _____________ ppm?


a5


b50


c2000


d5000


View Answer 50

There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ °C/km?


a0.05


b1


c6.5


d15


View Answer 6.5

Which of the following is the most widely used disinfectant in water treatment ?


aChlorine


b Irradiation of water by ultraviolet light


cCation exchanger


dCoagulation


View Answer Chlorine

Pick out the wrong statement ?


aNitrogen is normally supplied in fertiliser either in Ammoniacal or the nitrate form, from which the soil takes it up in the form of ammonium ions or nitrate ions and forms amino acids


b Calcium present in the fertiliser helps in correcting the soil acidity


cParticle size range of a good granular fertiliser is 10-15 mesh and it contains less moisture as compared to finely divided powder form of fertiliser


dAmmonium nitrate fertiliser is obtained as a by-product in an integrated steel plant having byproduct coke ovens



Which of the following is not a natural source of air pollution ?


aVolcanic eruptions and lightening discharges


bBiological decay of vegetable matter


cPhotochemical oxidation of organic matter


dNone of these


View Answer None of these

Pick out the wrong statement ?


a‘Green acid’ is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid


bChemically unreactive nature of red phosphorous is due to its polymeric structure


cRed phosphorous is the most reactive allotropic form of phosphorous


dRed phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation



Pick out the correct statement?


aReaction of NH3 with HNO3 to produce (NH4)2NO3 is endothermic


bWith increase in NH3/CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate


cBiuret (an intermediate during urea manufacture) is toxic to seeds and animals


dBoth B. and C.



Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?


a Respiratory & lung disease


bReduction in plant’s productivity owing to acid rain


cCorrosion of building materials


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?


aBenzopyrene


bPeroxyacetyl nitrate


cCarbon monoxide


dSulphur dioxide


View Answer Carbon monoxide

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