chemical engineering MCQs – Page 386

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
7701. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (? g)/litre?
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A. 1050

B. 332

C. 22

D. 42
7702. Pick out the wrong statement ?
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A. Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases

B. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation

C. burise the surface of steel at annealing temperatures

D. h increase in surface hardness

E. None of these

F. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen

7703. In the manufacture of urea, the intermediate chemical formed is__________________?
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A. Ammonium carbonate

B. Biuret

C. None of these

D. Ammonium carbamate
7704. A standard test for determination of hardness in water is termed as ______________ test?
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A. Electometric

B. EDTA

C. Total count

D. Presumptive

7705. Vetrocoke solution is_________________?
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A. Na2SO4

B. A mixture of Na2CO3 and As2O3

C. K2SO4

D. A mixture of K2CO3 and As2O3
7706. Biuret formation in urea is kept at minimum (< 1 %), because it is___________________?
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A. Helpful in decomposition of urea

B. Explosive in nature

C. Toxic and harmful to some crops

D. Corrosive in nature

7707. The weakest sound that can be heard by a person in a quiet environment is equivalent to ____________ decibel ?
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A. 10

B. 5

C. 50

D. 1
7708. Pick out the wrong statement ?
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A. te is termed s glass

B. Ceramic materials are brittle in nature

C. Non-oxide ceramic materials generally act as a semi-conductor

D. Ceramic materials do not undergo vitrification on heating

E. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous

7709. Action of phosphoric acid on rock phosphate produces_________________?
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A. Diammonium phosphate

B. Triple superphosphate

C. Nitrophosphate

D. Superphosphate

7710. Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at ______________ C?
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A. 250-300

B. 950-1050

C. 500-750

D. 1400-1450
7711. Chemical formula of meta-phosphoric acid is ___________________?
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A. H3PO4

B. H4P2O7

C. HPO3

D. Same as that of Pyrophosphoric acid

7712. Both white phosphorous as well as red phosphorous_________________?
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A. Burns when heated in air

B. All A., B., and C.

C. Reacts with hot caustic soda solution to give Phosphine

D. Are soluble in CS2

7713. Pick out the wrong statement?
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A. uces its shrinkage on burning

B. Main constituents of clay are alumina and silica

C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and

D. Fluxing material like lime is added in clay to reduce the vitrification temperature

E. Vitrification of fireclay material is done to increase its porosity
7714. Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth ?
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A. None of these

B. Potassic fertiliser

C. Nitrogenous fertiliser

D. Phosphatic fertiliser

7715. A nitrogenous fertiliser contains 20% N2. It could be_________________?
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A. Urea

B. Ammonium chloride

C. Calcium ammonium nitrate (CAN)

D. Ammonium nitrate

7716. Which of the following is not a measure component necessarily to be present in fertilisers ?
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A. Sulphur

B. Phosphorous

C. Potassium

D. Nitrogen

7717. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?
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A. 109

B. 1015

C. 105

D. 102

7718. Which of the following fertilizers is used as a cattle feed ?
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A. Calcium ammonium nitrate

B. Ammonium sulphate

C. Urea

D. Superphosphate

7719. Reaction of anhydrous liquid ammonia with ortho-phosphoric acid produces____________________?
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A. Triple superphosphate

B. Ammonium phosphate

C. Superphosphate

D. None of these

7720. Which is the best fertiliser for paddy ?
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A. Potassium nitrate

B. Nitro-phosphate

C. Superphosphate

D. Ammonium sulphate