Chemical Engineering MCQs

Page No. 47

pick out the wrong statement?


aDehydration of ammonium carbamate to produce urea is endothermic

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

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

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d Phosphate rock when reacted with dilute H2SO4 produces superphosphate

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


a5

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b50

✓


c2000

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d5000

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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

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b1

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c6.5

✓


d15

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View Answer 6.5

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


aChlorine

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b Irradiation of water by ultraviolet light

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cCation exchanger

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dCoagulation

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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

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

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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

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

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


aVolcanic eruptions and lightening discharges

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bBiological decay of vegetable matter

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cPhotochemical oxidation of organic matter

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dNone of these

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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

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

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cRed phosphorous is the most reactive allotropic form of phosphorous

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

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Pick out the correct statement?


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

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

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

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dBoth B. and C.

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Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?


a Respiratory & lung disease

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bReduction in plant’s productivity owing to acid rain

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cCorrosion of building materials

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dAll A., B. and C.

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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

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bPeroxyacetyl nitrate

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cCarbon monoxide

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dSulphur dioxide

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View Answer Carbon monoxide

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