chemical engineering MCQs – Page 378

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 Review each marked answer and report any item that may be outdated or unclear.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
7541. In natural gas, the C/H ratio (by weight) varies in the range of_________________?
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A. 15-17

B. 10-Aug

C. 20-25

D. 3-4
7542. ____________ catalyst is used in the production of urea from CO2 and NH3?
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A. Nickel

B. Vanadium pentoxide

C. Alumina

D. No
7543. Main constituent of phosphate rock is_____________________?
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A. Calcium fluoride

B. Ammonium phosphate

C. Calcium phosphate

D. Flour apatite
7544. Plant tranquillisers___________________?
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A. Hold back stem growth and halt plants at a desired height

B. Produce seedless fruit

C. Accelerate ripening of food and grain

D. Cause early maturation of plants

7545. A phosphatic fertiliser contains 16% P2O5. It could be________________?
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A. Dicalcium phosphate

B. None of these

C. Superphosphate

D. Triple superphosphate

7546. In calcium ammonium nitrate (CAN) fertiliser ____________________?
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A. Nitrate nitrogen is slower acting

B. Ammoniacal nitrogen is quick acting

C. Nitrate nitrogen is quick acting

D. None of these

7547. Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching ?
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A. Hexane

B. Butyl alcohol

C. Isopropyl alcohol

D. Toluene

7548. Gas based fertiliser plants use_________________?
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A. Coal gas as a source of hydrogen

B. Natural gas as a source of hydrogen

C. Natural gas as heating medium

D. Coal gas as heating medium

7549. A fertiliser contains 82% N2. It could be_____________________?
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A. None of these

B. Liquid NH3

C. Ammonium nitrate

D. Urea

7550. pH value of soil is maintained at ______________ by the addition of fertiliser for optimum growth and health of the plant?
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A. 7-8

B. 5-Apr

C. 13-Dec

D. 10-Sep

7551. Calcium ammonium nitrate (CAN) is__________________?
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A. Not a fertiliser; it is an explosive

B. A complex fertiliser

C. A straight fertiliser

D. A mixed fertiliser

7552. Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at ____________ C in absence of air?
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A. 250-400

B. 800-900

C. 50-80

D. 1000-1200

7553. Phosphatic fertilisers_________________?
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A. None of these

B. Lessen the effect of excessive nitrogen application

C. Accelerate fruit formation in later stages of growth

D. Are useful during early stage of the plant growth

7554. Raw materials for nitric acid manufacture are___________________?
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A. Anhydrous ammonia, air and water

B. Wet ammonia, air and water

C. Hydrogen peroxide, air and water

D. Anhydrous ammonia and air

7555. During nitric acid manufacture, catalytic oxidation of ammonia at 800C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about ______________ percent?
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A. 98

B. 68

C. 82

D. 38

7556. Phosphorus vapour comprises of ___________________?
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A. P2

B. P4

C. P3

D. P

7557. P2O5 content in triple superphosphate is about ______________ percent?
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A. 85-90

B. 70-75

C. 42-50

D. 15-20

7558. _____________ is required more for leafy crops?
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A. Phosphorous

B. Nitrogen

C. Potassium

D. Carbon

7559. HPO3 is the chemical formula of ______________ phosphoric acid?
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A. Meta

B. Pyro

C. None of these

D. Ortho

7560. (CH3 C6 H4)3 PO4 is the chemical formula of__________________?
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A. Triple superphosphate

B. Fluorapatite

C. Tricresyl phosphate

D. Superphosphate