chemical engineering Mcqs
1251. Which of the following is used as a coagulant in water treatment ?
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A. Ferrous sulphate

B. Hydrogen peroxide

C. Chlorine

D. Chloramine

1252. At very high concentration of enzymes, the rate of fermentation chemical reaction is _____________ the concentration of reactants?
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A. Proportional to the square of

B. Independent of

C. Directly proportional to

D. Inversely proportional to

1253. Thermosetting materials ______________________?
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A. None of these

B. Are solvent soluble

C. Soften on application of heat

D. Are cross-linked molecules
1256. Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda ?
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A. Diaphragm electrolytic cell process

B. Lime-soda process

C. Mercury electrolytic cell process

D. None of these

1257. Zeolite is a/an___________________?
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A. Abrasive material

B. None of these

C. Naturally occuring clay which is capable of exchanging cations

D. Catalyst used in shift conversion

1258. Ordinary glass is not a/an_________________?
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A. Material with sharp definite melting point

B. Electrical insulator

C. Supercooled liquid

D. Amorphous isotropic material

1259. Helium is produced on commercial scale from__________________?
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A. None of these

B. Natural gas

C. Coke oven gas

D. Air

1261. Pick out the wrong statement ?
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A. Contact process of sulphuric acid manufacture produces pure acid of concentration ? 98%

B. 75% oleum can be produced by distillation of 20% oleum

C. Contact process of sulphuric acid manufacture uses nickel as the catalyst

D. Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%

1262. Carboxymethyl cellulose (CMC) is added in detergents to act as a/an___________________?
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A. Optical brightening agent

B. Surfactant

C. Anti soil redeposition agent

D. Builder

1263. Reverse osmosis is normally used for the_______________?
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A. Separation of isotopes of uranium from gaseous uranium hexafluoride

B. Purification of oxygen

C. Separation of helium from natural gas

D. Desalination of brackish water to produce potable (drinking) water
1264. Which of the following is a detergent ?
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A. Alkyl benzene sulphonate

B. Benzene hexachloride

C. Cellulose nitrate

D. Polytetrafluoroethylene

1265. DDT should not be allowed to come in contact with iron (during its manufacture) to _______________?
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A. Prevent sulphonation of the monochlorobenzene by the acid catalyst

B. Achieve non-hygroscopic property

C. None of these

D. Avoid its decomposition
1267. Dehydrogenation of ethyl benzene produces __________________ ?
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A. Phenol

B. Styrene

C. Naphthalene

D. Benzoic acid

1268. Higher viscosity index of a lubricating oil denotes_______________?
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A. Its unsuitability under varying temperature conditions

B. None of these

C. Substantially high change in fluidity of oil with temperature

D. Less changes in fluidity of oil with temperature
1270. Addition of calcium oxide to water produces___________________?
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A. Slaked lime

B. All A , B. & C .

C. Hissing sound

D. Exothermic heat

1273. Pick out the wrong statement ?
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A. Insurance rates on annual basis in a chemical plant may be about 1% of the fixed capital

B. In a chemical industry, research and development cost amounts to about 15% of net sales

C. Annual depreciation rate of buildings in a chemical plant is about 3% of its initial cost

D. estment

E. The annual depreciation rate for machinery and equipments in a chemical process plant is

F. ut 10% of the fixed capital investment

1274. Styrene-butadiene-rubber (SBR) as compared to natural rubber has________________?
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A. Greater amount of heat build-up under heavy loading

B. Poorer resistance to oxidation

C. All A , B. and C.

D. Poorer tensile strength

1276. Vanillin is a type of____________________?
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A. Dye

B. Flavour

C. Anti-pyretic drug

D. Food preservative

1277. Which of the following is an organometallic compound ?
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A. Isopropyl alcohol

B. Tetra-ethyl lead

C. Zeolite

D. Cumene

1279. Alcohol is produced by the___________________?
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A. None of these

B. Esterification of a fat

C. Hydrolysis of an ether

D. Oxidation of an aldehyde

1280. Transparent soaps (e.g. Pears) are____________________?
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A. Metallic soaps with frothing agent from which glycerine has not been recovered

B. ally washed with methylated spirit to achieve transparency</strong>

C. Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and

D. Metallic soaps with frothing agent and free Stearic acid to achieve transparency

E. None of these

1281. Pick out the exothermic reaction out of the following ?
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A. CaC2 + H2O = Ca(OH)2 + C2H2

B. MgCO3 = MgO + CO2

C. All (A), B. and (C)

D. C + H2O = CO + H2

1282. Neoprene is chemically known as___________________?
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A. Styrene butadiene rubber (SBR)

B. Polyurethane

C. Polychlorophrene

D. Polybutadiene

1283. Calcination of gypsum produces__________________?
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A. Lime

B. Plaster of Paris

C. Nitre cake

D. Salt cake

1284. Catalytic oxidation of naphthalene produces_______________?
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A. Styrene

B. None of these

C. Phthalic anhydride

D. Phenol

1285. Pasteurisation of milk means______________________?
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A. None of these

B. Killing of organisms present in it by heating it at controlled temperature without changing its

C. ural characteristics</strong>

D. Inhibiting the growth of micro-organisms without killing them

E. Removal of fatty and albuminous substance from it

1287. In the Lurgi coal gasifier_________________?
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A. Large quantity of coal can be processed

B. Low carbon conversion efficiency is achieved

C. Entrainment of solids is higher

D. Coking coals cannot be used

1288. Ca(OH)2 is called __________________?
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A. Limestone

B. Slaked lime

C. Quicklime

D. Gypsum

1290. Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively ?
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A. Oxides of nitrogen & V2O5 on a porous carrier

B. V2O5 on a porous carrier & oxides of nitrogen

C. Oxides of nitrogen & Cr2O3

D. V2O5 & Cr2O3.

1291. Cumene (isopropyl benzene) is made by ____________________?
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A. Polymerisation of a mixture of benzene & propylene

B. Oxidation of naphthalene

C. None of these

D. Propylene alkylation of benzene
1292. Ethyl alcohol cannot be produced_________________?
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A. From molasses

B. From waste sulphite substrate of paper mills

C. By Esterification and hydrolysis of ethylene

D. None of these
1293. Starting raw material for the manufacture of alum is_________________?
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A. Ammonium bicarbonate

B. Bauxite

C. Gypsum

D. Alumina

1296. Pick out the wrong statement?
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A. osilicate and aluminium borosilicate

B. enic oxide

C. Hard glass which is used for making laboratory glass wares is a mixture of sodium

D. Ordinary glass is represented chemically by Na2O . CaO . 6SiO2

E. Glass is decolorized during its manufacture by adding antimony oxide, manganese dioxide or

F. Red color is imparted to glass by addition of arsenic oxide
1298. Which of the following is not a pyrite ore ?
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A. Galena

B. Gypsum

C. Celestite

D. Siderite
1300. The function of gypsum addition during cement making is to_________________?
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A. Increase the density of cement

B. Decrease the cement setting rate

C. Both A. and B.

D. Neither A. nor B.