chemical engineering Mcqs
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

7561. Phosphatic fertiliser is graded based on its _____________ content?
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A. H3PO4

B. P2O5

C. P2O3

D. PCl5

7562. Maximum nitrogen percentage is in________________?
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A. Urea

B. Liquid ammonia

C. Ammonium sulphate

D. Calcium ammonium nitrate

7563. In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process___________________?
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A. Uses lower grade phosphate rock

B. Is very costly

C. Produces lower purity acid

D. Requires lower capital investment in the plant

7564. Temperature and pressure in urea autoclave is_________________?
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A. 400C and 550 atm

B. 120C and 300 atm

C. 200C and 10 atm

D. 190C and 200 atm
7565. The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about ____________ percent?
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A. 60

B. 30

C. 95

D. 100

7566. Yield of elemental phosphorous from rock phosphate is about _____________ percent?
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A. 60-65

B. 2-Jan

C. 40-45

D. 15-25
7567. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earths 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?
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A. 0.05

B. 6.5

C. 15

D. 1

7568. Steam reforming of naphtha is a source of hydrogen production for nitrogenous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha ?
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A. 1.5 : 1

B. 3.5 : 1

C. 10:01

D. 15:01

7569. Which of the following fertilisers contains the least percentage of nitrogen ?
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A. Ammonium sulphate

B. Urea

C. Ammonium phosphate

D. Liquid ammonia

7570. C/H ratio (by weight) of naphtha used in nitrogenous fertiliser making is about_________________?
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A. 13

B. 20

C. 2

D. 6
7571. Ammonium sulphate can be produced by reacting gypsum with____________________?
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A. Nitric acid

B. Ammonium carbonate

C. Ammonia

D. None of these

7572. The most suitable fertiliser for accelerating seeding or fruit formation in later stages of plant growth is _____________ fertiliser?
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A. Phosphatic

B. Nitrogenous

C. Potassic

D. None of these

7573. Nitrogen content of calcium ammonium nitrate (CAN) is _____________ percent?
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A. 25

B. 10

C. 50

D. 80

7574. The optimum size of the ammonia plant is ______________ tons/day?
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A. 10

B. 100

C. 1000

D. 1000

7575. Removal of ______________ results from the disinfection of water?
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A. Bacteria

B. Odour

C. Turbidity

D. Hardness

7576. Pick out the wrong statement?
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A. Gypsum (CaSO4. 2H2O) is obtained as a by-product in the wet process for manufacture of

B. Phosphate rock when reacted with dilute H2SO4 produces superphosphate

C. Dehydration of ammonium carbamate to produce urea is endothermic

D. Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable

E. ho-phosphoric acid

7577. Tricresyl phosphate is chemically represented as___________________?
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A. (CH3 C6 H4)3 PO4

B. (NH4)2HPO4

C. NH4H2PO4

D. Ca10(PO4)3F6

7578. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
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A. CO

B. SO2

C. CFC (chloro fluoro carbons)

D. NOx

7579. ______________ is the process of killing organism in water ?
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A. Sterilisation

B. Disinfection

C. Coagulation

D. Sedimentation

7580. Threshold limit value (TLV) of CO in air is _____________ ppm?
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A. 50

B. 5

C. 2000

D. 5000

7581. Regenerators are normally provided in the____________________?
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A. All A., B. and C.

B. Glass melting furnace

C. Open hearth furnace

D. By product coke ovens

7582. Which of the following nitrogenous fertilisers has the highest percentage of nitrogen ?
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A. Ammonium sulphate

B. Calcium nitrate

C. Calcium ammonium nitrate (CAN)

D. Urea
7583. Red phosphorous is changed into white phosphorous by______________________?
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A. Melting under pressure

B. None of these

C. Vaporisation followed by condensation

D. Heating in presence of light

7584. Disinfection of water is done to remove ______________________?
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A. Foul odour

B. Color

C. Bad taste

D. Bacteria
7585. Pick out the wrong statement ?
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A. called its flash point</strong>

B. Maximum yield of naphthalene is obtained on distillation of crude oil

C. als

D. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas

E. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of

F. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn,
7586. Commercial fertilisers are available mostly in the form of__________________?
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A. Powder

B. Flakes

C. Granules

D. Lumps

7587. Urea is formed only____________________?
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A. At very low pressure (vacuum)

B. In liquid phase

C. In vapour phase

D. At very high temperature

7588. Effectiveness of a fertiliser is independent of the ___________________?
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A. Type of crop

B. None of these

C. pH of soil

D. Nature of soil

7589. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in gas chamber is about ______________ ppm?
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A. < 1

B. 10-100

C. 100-1000

D. 100-200

7590. Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of_________________?
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A. Phosphorous

B. Triple superphosphate

C. Phosphoric acid

D. Superphosphate

7591. Flushing liquor used for cooling coke oven gas constitutes of __________________?
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A. Dilute H2SO4

B. Dilute HCl

C. Ammoniacal liquor

D. K2CO3 solution

7592. Prilling tower is found in the flowsheet for the manufacture of__________________?
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A. Urea

B. Ammonia

C. Superphosphate

D. Triple superphosphate

7593. Commercial production of hydrogen for the manufacture of nitrogenous fertilisers is done by________________?
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A. Steam reforming of naphtha and cracking of natural gas

B. All A., B. and C.

C. Cryogenic separation of hydrogen from coke oven gas

D. Electrolysis of water

7594. Maximum stability of white phosphorous is at__________________?
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A. Atmospheric pressure

B. Room temperature

C. > 600C

D. Very high pressure

7595. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?
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A. Stratosphere

B. Troposphere

C. Thermosphere

D. None of these

7596. Promoter used in NH3 synthesis catalyst is__________________?
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A. K2O

B. SiO3

C. U2O3

D. V2O5
7597. The essential ingredient of all the synthesis gas is___________________?
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A. H2

B. CO2

C. O2

D. N2

7598. Main component of bone ash is _________________?
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A. Calcium phosphate

B. Calcium carbonate

C. Sodium phosphate

D. Calcium sulphate

7599. A mixture of phosphate rock ______________ is heated in an electric furnace to produce phosphorous?
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A. Salt & coke

B. And coke

C. Sand & coke

D. And sand

7600. Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the _______________ process?
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A. Habers

B. Stengel

C. Du-ponts

D. Le-chateliers