chemical engineering Mcqs
1451. Main constituents of natural rubber is____________________?
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A. Polychlorophrene

B. Polystyrene

C. Polyisoprene

D. Polybutadiene

1452. Commercial production of calcium carbide requires limestone and __________________ as raw materials?
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A. Fuel oil

B. Soda ash

C. Sand

D. Coke

1453. The temperature in the calcium carbide furnace is _______________ C ?
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A. 700-850

B. 200-300

C. 2000-2200

D. 4000-4500

1454. Litharge is________________?
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A. Zinc oxide

B. Lead oxide

C. Cellulosic photographic material

D. Zinc sulphide

1455. Concentration of sulphide ores is done usually by____________________?
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A. Roasting

B. Froth floatation

C. Smelting

D. Electromagnetic separation

1456. Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of_________________?
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A. Carbon

B. Lead

C. Arsenic

D. Sulphur

1457. Which oil is preferred for paint manufacture ?
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A. Drying oil

B. Non-drying oil

C. Semi-drying oil

1458. Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as ____________________ oil?
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A. Non-drying

B. None of these

C. Semi-drying

D. Drying

1459. A unit process is exemplified by the___________________?
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A. Hydrogenation of oils

B. Humidification

C. Absorption

D. Distillation

1460. Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the_______________?
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A. Synthesis of oleum

B. Car battery solution

C. Water treatment

D. Fertiliser manufacture

1461. Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about _____________ percent?
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A. 75

B. 50

C. < 10

D. > 30

1462. 10% oleum comprises of 10% free_________________?
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A. H2SO3

B. SO2

C. SO3

D. H2SO4

1463. _________________ is not a constituent of gun powder?
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A. Charcoal

B. Sulphur

C. Carbon

D. Potassium nitrate

1464. Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at __________________?
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A. 1 atm & 100C

B. 5 atm & 275C

C. 50 atm & 1000C

D. 100 atm & 500C

1465. Pick out the wrong statement?
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A. Gypsum is added to Portland cement to lengthen its setting time

B. None of these

C. Dry process is used for the manufacture of cement, when the raw material is blast furnace slag

D. Portland cement is made employing wet process

1466. Producer gas consists mainly of________________________?
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A. CO, H2

B. H2, CH4

C. CO, CO2 N2, H2

D. C2H2, CO2, H2

1467. The type of high refractive index glass used in optical instruments is _____________ glass?
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A. Flint

B. Pyrex

C. Crookes

D. None of these

1468. Sodium chloride content in sea water is about _______________ gms/liter?
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A. 10

B. 25

C. 50

D. 2

1469. High temperature carbonisation of coal produces _____________________ ?
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A. Less of gases compared to liquid products

B. None of these

C. Larger quantity of tar compared to low temperature carbonisation

D. Inferior coke compared to low temperature carbonisation

1470. Chloral is used in the manufacture of__________________?
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A. Parathion

B. BHC

C. None of these

D. DDT
1471. The combustion reaction, C + O2 = CO2, is__________________?
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A. Exothermic

B. Autocatalytic

C. None of these

D. Endothermic

1472. Dry ice (solidified CO2) is used for the___________________?
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A. Liquefaction of natural gas

B. None of these

C. Liquefaction of permanent gases

D. Storage & shipment of frozen foods and ice-creams
1473. Massecuite is a terminology used in the ______________ industry ?
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A. Soap

B. Paint

C. Sugar

D. Oil hydrogenation

1474. Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of_________________?
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A. Molasses

B. Tannin

C. Carbohydrate

D. Collagen
1475. Tall oil obtained as a by-product from the black liquor recovery is________________?
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A. All A , B. & C.

B. Used in the manufacture of greases, emulsions & soaps

C. Composed mainly of rosin & fatty acids

D. A black, sticky & viscous liquid

1476. Fusel oil is a/an_________________?
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A. Extract from medicinal herbs

B. ohol from molasses)</strong>

C. Essential oil

D. None of these

E. Mixture of higher molecular weight alcohols (a by-product obtained during production of
1477. Sulphur removal by heating of pyrite ore in presence of air is called its ____________________?
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A. Reduction

B. Smelting

C. Calcination

D. Roasting
1478. Conversion of SO2 to SO3 in Monsanto 4-pass converter is about ____________________ percent?
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A. 90

B. 80

C. 98

D. 100

1479. Pick out the wrong statement pertaining to the soap manufacture?
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A. Transparent soaps are made by cold process

B. Organic pigments are used as colouring materials in the soap manufacture

C. Both laundry as well as toilet soaps are manufactured by hot process

D. Colourless rosin is used in the manufacture of laundry soaps

1480. Cooking liquor in case of sulphite process is _____________________?
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A. Magnesium sulphite and free SO2 in acid medium

B. Magnesium sulphate and magnesium bicarbonate

C. None of these

D. Sodium sulphite and sodium bisulphite
1481. The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by_________________?
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A. None of these

B. Electrolysis

C. Electrolytic oxidation

D. Electrolytic reduction
1482. Thorium is mainly used _______________?
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A. In the manufacture of hydrogen bomb

B. In the treatment of cancer

C. As a fissile fuel in a nuclear reactor

D. For the manufacture of gas mantles
1483. Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is ____________ C?
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A. 30 to 50

B. 5 to 10

C. 75 to 80

D. -5 to 0

1484. Diaphragm electrolytic cell as compared to mercury electrolytic cell_____________________?
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A. Requires lesser investment for similar capacity

B. Produces 70% NaOH solution

C. All A , B. and C

D. Requires less specific power consumption for the production of chlorine

1485. Glycerine is not used in the____________________?
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A. Conditioning and humidification of tobacco

B. None of these

C. Manufacture of explosive

D. Manufacture of pharmaceuticals

1486. Main constituent of dolomite is __________________?
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A. Na2CO3

B. MgCO3

C. CaCO3

D. K2CO3

1487. Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have___________________?
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A. Low co-efficient of thermal expansion

B. High electrical insulation properties

C. Compressive strength much greater than their tensile strengths

D. Sharp melting points
1488. Cement mainly contains_________________?
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A. CaO, SiO2, Al2O3

B. Al2O3, MgO, Fe2O3

C. MgO, SiO2, K2O

D. CaO, MgO, K2O

1489. Sucrose is a disaccharide consisting of____________________?
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A. Glucose and glucose

B. Fructose and galactose

C. Glucose and galactose

D. Glucose and fructose
1490. Liquor poisoning generally occurs due to the presence of _________________ in it ?
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A. Carbonic acid

B. Impurities

C. Methyl alcohol

D. Ethyl alcohol

1491. Salt cake is chemically represented by_________________?
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A. BaSO4

B. MgSO4

C. CaSO4. H2O

D. Na2SO4
1492. Which of the following is not required in the manufacture of soda ash by Solvay process ?
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A. Limestone

B. None of these

C. Ammonia

D. Nitric acid
1493. Hydrogenation of oil/fat does not_________________?
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A. Improve its resistance to rancid oxidation

B. Remove double bonds

C. Raise its melting point

D. None of these
1494. Oxygen is produced by fractionation of air using _____________ process?
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A. Claudes

B. Lindes

C. Either A. or B.

D. None of these

1495. Large scale drying of sugar is done in a _______________ dryer?
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A. Spouted bed

B. Truck

C. Rotary

D. Tray

1496. Soaps remove dirt by ____________________?
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A. Increasing the surface tension

B. None of these

C. Supplying hydrophilic group

D. Decreasing wettability

1497. Separation of two volatile liquids by distillation makes use of their___________________?
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A. Relative volatility

B. Selectivity

C. Solubility

D. Density difference

1498. _____________ extractor is used for the concentration of radioactive nuclear waste?
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A. Sieve plate

B. Mixer-settler

C. Bollman

D. Pulsed column
1499. Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ?
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A. Calcium & aluminium stearate

B. Stearic acid

C. Formic acid

D. Xanthates

1500. Blue vitriol is chemically___________________?
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A. Aluminium sulphate

B. Copper sulphate

C. Ferrous sulphate

D. Copper nitrate