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
7721. Catalyst used in steam reforming of naphtha is__________________?
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A. Silica gel

B. Rhodium

C. Nickel

D. Platinum

7722. Catalyst used in steam reforming of naphtha is ___________________?
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A. Cobalt

B. Chromium

C. Bauxite

D. Nickel oxide on alumina support
7723. H3PO4 is the chemical formula of ______________ phosphoric acid?
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A. Meta

B. Pyro

C. Ortho

D. None of these

7724. Bio-fertilisers are cheaper, renewable and pollution free. They improve the _____________ of the soil?
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A. All A., B. and C.

B. Nutrient supply

C. Texture

D. Water holding capacity

7725. Pick out the wrong statement ?
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A. High concentration of oxygen in flue gas means high stack loss

B. Gaseous fuels require the least % excess air for complete combustion

C. The ratio of fixed carbon to volatile matter percentage in coal is called its fuel ratio

D. Calorific value of natural gas is more than that of LPG
7726. Steam reforming of naphtha produces ammonia synthesis gas. This is a/an ____________ process?
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A. Autocatalytic

B. Endothermic

C. Non-catalytic

D. Exothermic

7727. A fertiliser plant is classified as a gas based fertiliser plant, when it uses ______________ gas as a source of hydrogen for the manufacture of ammonia?
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A. Natural

B. Producer

C. Coke oven

D. Coal

7728. A Potassic fertiliser contains 50% K2O. It could be _________________?
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A. None of these

B. Potassium chloride

C. Potassium sulphate

D. A mixture of NaCl + KCl

7729. Which of the following does not come under the category of secondary nutrient for plant growth ?
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A. Oxygen

B. Magnesium

C. Sulphur

D. Calcium

7730. Pick out the correct statement?
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A. Reaction of NH3 with HNO3 to produce (NH4)2NO3 is endothermic

B. With increase in NH3/CO2 ratio, urea yield decreases for a given temperature, pressure and

C. al feed rate</strong>

D. Biuret (an intermediate during urea manufacture) is toxic to seeds and animals

E. Both B. and C.

7731. During conversion of ammonium carbamate into urea, presence of large excess of water______________?
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A. Adversely affects the yield of urea

B. Reduces the evaporator load by diluting the urea solution

C. Increases the yield of urea

D. Does not affect the yield of urea

7732. Reaction of ortho-phosphoric acid with soda ash produces______________?
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A. Tributyl phosphate

B. Tricresyl phosphate

C. Sodium Tributyl phosphate (STPP)

D. Nitrophosphate

7733. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
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A. Ozone and iodine

B. Ultraviolet light for irradiation of water

C. Chlorine or its compounds

D. All A., B. & C.
7734. Nitrolime is___________________?
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A. Calcium ammonium nitrate

B. A mixture of ammonium nitrate and calcium nitrate

C. A mixture of nitric acid and lime

D. Calcium nitrate

7735. Reaction of Cresylic acid with _____________ produces Tricresyl phosphate?
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A. Phosphorous pentoxide

B. Calcium phosphate

C. Ammonium phosphate

D. Phosphorous oxychloride
7736. Which of the following set of conditions is favourable for the maximum yield of ammonia by Habers process ?
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A. High pressure, high reactants concentration, low temperature

B. High pressure, low reactants concentration, high temperature

C. Low pressure, high reactants concentration, low temperature

D. High pressure, low reactants concentration, low temperature

7737. An increase in the NH3/CO2 ratio in urea manufacture results in__________________?
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A. Decreased yield of urea

B. Increased degree of conversion of CO2 to urea

C. Decreased degree of conversion of NH3 to urea

D. Decreased specific volume of molten mass

7738. Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?
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A. None of these

B. Ammonia

C. Fine dolomite

D. Alkaline powders

7739. Ammonium nitrate (a fertiliser) is coated with limestone powder to ____________________?
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A. Increase its nitrogen content

B. Add extra nutrient as fertiliser

C. Avoid the risk of explosion

D. Cut down its production cost

7740. Which fertiliser is made (using coke oven gas) in by products plant of an integrated steel plant ?
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A. Urea

B. Superphosphate

C. CAN

D. Ammonium sulphate
7741. Pick out the wrong statement ?
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A. Refractories used for lining electrical furnaces should ordinarily have very low electrical

B. Electrical conductivity of porous refractory material is low

C. ctrical insulators

D. naces</strong>

E. ductivity

F. Electrical conductivity of refractory is not important, when these are to be used in electrical
7742. Ostwald charts are meant for__________________?
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A. Computing the excess/deficiency of combustion air

B. None of these

C. Computation of flue gas analysis

D. Calculation of flue gas temperature

7743. Triple superphosphate which contains about 46% P2O5 is produced by the reaction of phosphate rock with ortho phosphoric acid of_____________ percent concentration?
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A. 25-28

B. 75-80

C. > 98

D. 52-54
7744. Noise pollution level in a chemical plant is expressed in __________________?
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A. Roentgen

B. Hertz

C. Decibel

D. None of these

7745. H4P2O7 is the chemical formula of _____________ phosphoric acid?
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A. Ortho

B. Pyro

C. Meta

D. None of these

7746. Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it___________________?
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A. Vaporises at normal temperature

B. Is toxic and highly corrosive

C. Has a pungent smell

D. Is in short supply

7747. Urea is represented as______________________?
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A. NH2.CO.NH2

B. NH.CO2.NH

C. NH3.CO2.NH3

D. NH3CO.CH3

7748. Phosphoric acid is produced in wet process from phosphate rock and____________________?
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A. Concentrated HCl

B. Dilute H2SO4

C. Concentrated H2SO4

D. Concentrated NHO3

7749. Ammonium sulphate fertiliser is __________________?
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A. The highest concentration nitrogenous fertiliser

B. A basic fertiliser

C. The best fertiliser for paddy

D. A neutral fertiliser

7750. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?
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A. Lead

B. Aluminium

C. Mercury

D. Arsenic