MCQOPTIONS
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MCQOPTIONS
This section includes 1331 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to |
| A. | increase the rate of absorption. |
| B. | avoid corrosion. |
| C. | reduce the cooling water circulation rate. |
| D. | none of these. |
| Answer» C. reduce the cooling water circulation rate. | |
| 652. |
Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction. |
| A. | endothermic |
| B. | exothermic |
| C. | irreversible |
| D. | both (b) and (c) |
| Answer» E. | |
| 653. |
Favourable conditions for the liquefaction of gases in general are |
| A. | high pressure & low temperature. |
| B. | low pressure & high temperature. |
| C. | high pressure & high temperature. |
| D. | low pressure & low temperature. |
| Answer» B. low pressure & high temperature. | |
| 654. |
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it |
| A. | has larger production capacity per unit cell. |
| B. | consumes less power per ton of Cl₂ produced. |
| C. | produces high purity (70%) caustic soda directly. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 655. |
White phosphorous is stored under water, because |
| A. | it does not react with water. |
| B. | it is poisonous. |
| C. | its kindling temperature in dry air is very low. |
| D. | it is unstable. |
| Answer» D. it is unstable. | |
| 656. |
Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene ? |
| A. | AgO |
| B. | Al₂O₃ |
| C. | ZnCl₂ |
| D. | Fe₂O₃ |
| Answer» B. Al₂O₃ | |
| 657. |
Sand and __________ is fused at 1300°C, to produce sodium silicate. |
| A. | limestone |
| B. | soda ash |
| C. | coke |
| D. | sodium sulphate |
| Answer» C. coke | |
| 658. |
Wet chlorine gas produced during electrolysis of brine is dehydrated by |
| A. | spraying 66° Be H₂SO₄ counter current to the flow of the gas. |
| B. | passing it through a bed of diatomaceous earth. |
| C. | passing it through a bed of silica gel. |
| D. | none of these. |
| Answer» B. passing it through a bed of diatomaceous earth. | |
| 659. |
Which of the following is a constituent of vinegar ? |
| A. | Around 10% alcohol |
| B. | Around 1% acetic acid |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» D. Neither (a) nor (b) | |
| 660. |
Trinitrotoluene (TNT), an explosive, is made by the nitration of |
| A. | nitrobenzene |
| B. | toluene |
| C. | nitrotoluene |
| D. | benzene |
| Answer» C. nitrotoluene | |
| 661. |
In the production of soda ash by Solvay process, the by-product is |
| A. | CaCl₂ |
| B. | NH₄Cl |
| C. | NH₃ |
| D. | NaOH |
| Answer» B. NH₄Cl | |
| 662. |
Which form of sulphur is the most stable at room temperature ? |
| A. | Plastic |
| B. | Monoclinic |
| C. | Rhombic |
| D. | Flowers of sulphur |
| Answer» D. Flowers of sulphur | |
| 663. |
Phenolic antiseptics are added in the __________ soap. |
| A. | shaving |
| B. | medicated |
| C. | metallic |
| D. | transparent |
| Answer» C. metallic | |
| 664. |
Air used in aerobic fermentation must be sterilized, otherwise the |
| A. | recovery of product will be difficult. |
| B. | contamination of pure culture would result. |
| C. | uniformity of product cannot be achieved. |
| D. | none of these. |
| Answer» C. uniformity of product cannot be achieved. | |
| 665. |
Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an |
| A. | explosive |
| B. | soap |
| C. | detergent |
| D. | analgesic drug |
| Answer» D. analgesic drug | |
| 666. |
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its |
| A. | poor oxidation stability and high gum forming tendency. |
| B. | greater tendency of decomposition at elevated temperature. |
| C. | hydrolysis tendency in presence of water. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 667. |
Which is the most suitable dye for synthetic fibres ? |
| A. | Acid dye |
| B. | Azoic dye |
| C. | Pigment dye |
| D. | Mordant dye |
| Answer» B. Azoic dye | |
| 668. |
In the Solvay process, the product from the calciner is |
| A. | light soda ash |
| B. | dense soda ash |
| C. | sodium bicarbonate |
| D. | dehydrated soda ash |
| Answer» B. dense soda ash | |
| 669. |
Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ? |
| A. | NH₃ |
| B. | NaCl |
| C. | CaO |
| D. | Coke |
| Answer» B. NaCl | |
| 670. |
At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants. |
| A. | independent of |
| B. | directly proportional to |
| C. | inversely proportional to |
| D. | proportional to the square of |
| Answer» B. directly proportional to | |
| 671. |
Which oil is preferred for paint manufacture ? |
| A. | Drying oil |
| B. | Non-drying oil |
| C. | Semi-drying oil |
| D. | Saturated oil |
| Answer» B. Non-drying oil | |
| 672. |
Which of the following, when pyrolysed, produces perchloro-ethylene ? |
| A. | Ethylene dichloride |
| B. | Chlorobenzene |
| C. | Carbon tetrachloride |
| D. | Chlorinated paraffin |
| Answer» D. Chlorinated paraffin | |
| 673. |
Styrene-butadiene-rubber (SBR) as compared to natural rubber has |
| A. | Poorer tensile strength. |
| B. | poorer resistance to oxidation. |
| C. | greater amount of heat build-up under heavy loading. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 674. |
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because |
| A. | its calorific value is very less. |
| B. | tar neutralises the residual acids present in pitch. |
| C. | it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop. |
| D. | all (a), (b) and (c). |
| Answer» D. all (a), (b) and (c). | |
| 675. |
In sulphate pulp manufacture, the pressure and temperature in the digestor is |
| A. | 10 atm., 800 °C |
| B. | 10 atm., 170-180°C |
| C. | 1 atm., 170 - 180°C |
| D. | l atm., 800°C |
| Answer» C. 1 atm., 170 - 180°C | |
| 676. |
Fusion of bauxite and __________ produces high alumina cement. |
| A. | alum |
| B. | limestone |
| C. | coke |
| D. | quartz |
| Answer» C. coke | |
| 677. |
The gasification reaction represented by, C + H₂O = CO + H₂, is a/an __________ reaction. |
| A. | exothermic |
| B. | endothermic |
| C. | catalytic |
| D. | autocatalytic |
| Answer» C. catalytic | |
| 678. |
Gun powder, which is an explosive comprises of charcoal, sulphur and |
| A. | glycerene |
| B. | salt petre |
| C. | nitro glycerene |
| D. | dynamite |
| Answer» C. nitro glycerene | |
| 679. |
Which is the main reducing agent during production of iron from iron ore in a blast furnace ? |
| A. | C |
| B. | CO |
| C. | CO₂ |
| D. | H₂ |
| Answer» C. CO₂ | |
| 680. |
Which of the following is an organo-metal-lic compound ? |
| A. | Isopropyl alcohol |
| B. | Tetra-ethyl lead |
| C. | Zeolite |
| D. | Cumene |
| Answer» C. Zeolite | |
| 681. |
Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials. |
| A. | adsorbs |
| B. | oxidises |
| C. | reduces |
| D. | converts |
| Answer» B. oxidises | |
| 682. |
In the manufacture of viscose rayon, the raw material used industrially is |
| A. | recalyptious wood |
| B. | bamboo |
| C. | bagasse |
| D. | fine teak wood |
| Answer» E. | |
| 683. |
The combustion reaction, C + O₂ = CO₂, is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 684. |
__________ acid is the main constituent of cotton seed oil. |
| A. | Acetic |
| B. | Linoleic |
| C. | Palmitic |
| D. | Oleic |
| Answer» C. Palmitic | |
| 685. |
__________ process is used for the manufacture of sodium carbonate by ammonia soda process. |
| A. | Ostwald's |
| B. | Bosch |
| C. | Solvay |
| D. | Haber's |
| Answer» D. Haber's | |
| 686. |
Function of thinner in a paint is to |
| A. | Accelerate the oxidation of oil |
| B. | Prevent gelling of the paint |
| C. | Suspend pigments & dissolve film forming materials |
| D. | Form a protective film |
| Answer» D. Form a protective film | |
| 687. |
Liquefaction of gases can not be done by |
| A. | Exchange of heat with colder stream |
| B. | Adiabatic expansion through a throttle valve (Joule-Thomson expansion) |
| C. | Merely compressing it beyond critical pressure |
| D. | Adiabatic expansion against a piston or in a turbine |
| Answer» D. Adiabatic expansion against a piston or in a turbine | |
| 688. |
__________ iron is the purest form of iron. |
| A. | Cast |
| B. | Wrought |
| C. | Pig |
| D. | High silicon |
| Answer» C. Pig | |
| 689. |
Process conditions in fermentator used for production of penicillin is |
| A. | 25°C, 2 atm |
| B. | 50°C, l0 atm |
| C. | 30°C, 200 mm Hg (absolute) |
| D. | 90°C, 45 atm |
| Answer» B. 50°C, l0 atm | |
| 690. |
Which of the following is the main constituent of the mother liquor produced in salt industry? |
| A. | Quick lime |
| B. | Glauber's salt |
| C. | Salt petre |
| D. | Bromine |
| Answer» E. | |
| 691. |
Major component of flint glass is |
| A. | Lead oxide |
| B. | Silica |
| C. | Alumina |
| D. | Soda |
| Answer» B. Silica | |
| 692. |
Main constituents of cotton fiber is |
| A. | Lignin |
| B. | Cellulose |
| C. | Starch |
| D. | Gelatine |
| Answer» C. Starch | |
| 693. |
Which one of the following is not likely to be a constituent of vegetable oils? |
| A. | Citric acid |
| B. | Oleic acid |
| C. | Stearic acid |
| D. | Glycerol |
| Answer» B. Oleic acid | |
| 694. |
Oleum produces fumes of |
| A. | SO₂ |
| B. | H₂SO₄ |
| C. | SO₃ |
| D. | SO₂ + H₂SO₄ |
| Answer» D. SO₂ + H₂SO₄ | |
| 695. |
High acid value of an oil or fat is an indication of |
| A. | Storage under improper conditions |
| B. | Absence of unsaturation |
| C. | Its smaller molecular weight |
| D. | None of these |
| Answer» B. Absence of unsaturation | |
| 696. |
Saponification value/number of an oil or fat is a measure of its |
| A. | Fatty acid content |
| B. | Degree of unsaturation of the fatty acids present in it |
| C. | Average molecular weight |
| D. | Insoluble fatty acid content |
| Answer» D. Insoluble fatty acid content | |
| 697. |
Oil is a/an |
| A. | Mixture of glycerides |
| B. | Mixture of glycerides of fatty acids |
| C. | Solid at normal temperature |
| D. | Ester of alcohols other than glycerine |
| Answer» C. Solid at normal temperature | |
| 698. |
Nylon-6 is manufactured from |
| A. | Caprolactum |
| B. | Hexamethylene diamine and adipic acid |
| C. | Hexamethylene diamine and maleic anhydride |
| D. | Hexamethylene diamine and sebacic acid |
| Answer» B. Hexamethylene diamine and adipic acid | |
| 699. |
DDT should not be allowed to come in contact with iron (during its manufacture) to |
| A. | Avoid its decomposition |
| B. | Prevent sulphonation of the monochlorobenzene by the acid catalyst |
| C. | Achieve non-hygroscopic property |
| D. | None of these |
| Answer» B. Prevent sulphonation of the monochlorobenzene by the acid catalyst | |
| 700. |
Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance. |
| A. | Flint |
| B. | Soda |
| C. | Pyrex |
| D. | Potash |
| Answer» D. Potash | |