chemical engineering chemical process Mcqs
601. Which of the following is used as a coagulant in treating turbid water ?
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A. Calcium sulphate

B. Ferric sulphate

C. Chlorine

D. Activated carbon

602. Glycerine can be obtained from ________________ ?
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A. Naphthalene

B. Cumene

C. Fat

D. Sucrose

603. Gypsum is chemically __________________ ?
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A. Potassium sulphate

B. Calcium chloride

C. Calcium sulphate

D. Sodium sulphate

604. Pick out the wrong statement ?
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A. Chloral is obtained by the chlorination of ethyl alcohol

B. DDT is manufactured by the condensation of chlorobenzene with chloral at 30C in presence

C. Insecticides acting on the insects through the respiratory system are called fumigants

D. Benzene hexachloride is not a contact insecticide

E. oleum, which is a highly exothermic reaction

605. Hollander beater machine used in the paper manufacturing plant does not accomplish the task of____________________?
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A. Hydration of fibres

B. Cutting of fibres

C. Fibrillation of fibre

D. Final rolling out of paper
606. Most widely and commonly used coagulant for the removal of suspended impurities in water is __________________?
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A. Alum

B. Slaked lime

C. Copper sulphate

D. Bleaching powder

607. Pick out the wrong statement ?
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A. High early strength cement are made from materials having high silica to lime ratio

B. Major component of greyish Portland cement is tricalcium silicate

C. Acid resistant cements are known as silicate cement

D. The function of gypsum in cement is to enhance its initial setting rate

608. Silicon carbide is a/an_______________?
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A. Type of glass

B. Adhesive

C. Brittle material

D. Abrasive
609. Parathion and Malathion are _____________________?
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A. Pain-relieving drugs (analgesic)

B. Pesticides

C. Tranquilisers

D. Plasticisers for unsaturated polyesters

610. Permanent hardness of water is due to the presence of calcium & magnesium __________________?
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A. Sulphates & chlorides

B. Bi-carbonates

C. Carbonate

D. None of these

611. Which of the following is a constituent of coffee ?
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A. Lignin

B. Caffeine

C. Calgon

D. Nicotine

612. A bio-catalyst produced by living cells which acts independent of the cell is called a/an_______________?
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A. None of these

B. Enzyme

C. Substrate

D. Nutrient

613. The major constituent of black liquor generated during paper manufacture is sodium___________________?
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A. Hydroxide

B. Carbonate

C. Bi-carbonate

D. Sulphate

614. Grignard reagent is chemically known as ____________________?
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A. Dichlorophenol

B. Methyl magnesium chloride

C. Ethyl magnesium chloride

D. Monochloroacetic acid

615. Hydrogenation of vegetable oils is a/an _______________ reaction ?
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A. Autocatalytic

B. Endothermic

C. Homogenous

D. Exothermic
616. Washing soda is chemically represented by _________________?
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A. Na2CO3.H2O

B. Na2CO3.10H2O

C. NaHCO3

D. Na2CO3

617. Electric bulbs are made of _______________ glass ?
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A. Pyrex

B. Flint

C. Crookes

D. Jena

618. Use of hydrated lime in water treatment_________________?
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A. Is to adjust the pH value

B. Before filtration, reduces the bacterial load on filters

C. After filtration, combats the corrosiveness of water due to the presence of O2 & CO2

D. All A , B. and C.
619. Use of water having dissolved oxygen in boilers promotes___________________?
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A. None of these

B. Sequestration

C. Scale formation

D. Corrosion
620. Flash point of most vegetable oils is about _______________ C ?
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A. 100

B. 200

C. 50

D. 300

621. Electro deposition of metals i.e. electroplating is never done on_____________________?
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A. Non-metals

B. Alloys

C. Refractories

D. Metals

622. Sucrose content in cane sugar may be around ______________________ percent ?
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A. 95

B. 80

C. 70

D. 50

623. Free alkali in a toilet soap is _______________ that in a laundry shop ?
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A. More than

B. None of these

C. Less than

D. Same

624. Which of the following is a detergent ?
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A. Alkyl benzene sulphonate (ABS)

B. Methylene chloride

C. Fatty alcohol

D. Fatty acids

625. Deaeration of water in its treatment is necessary, as it___________________?
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A. Minimises its corrosiveness

B. Minimises its turbidity

C. None of these

D. Helps in controlling its taste and odour

626. Dacron (or Terylene) fibres as compared to nylon fibres have__________________?
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A. Poorer dyeability

B. Poorer resistance to alkalis

C. All A , B. and C.

D. Better heat & acid resistant properties

627. Paper grade bamboo contains about _______________ percent cellulose ?
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A. 5

B. 60

C. 40

D. 20

628. Which of the following is a constituent of vinegar ?
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A. Around 10% alcohol

B. Around 1% acetic acid

C. Both A. and B.

D. Neither A. nor B.

629. Absorption of SO3 in 97% H2SO4 is_______________?
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A. Not possible

B. Exothermic

C. None of these

D. Endothermic

630. Sudden temperature fluctuation does not affect pyrex glass, because of its __________________?
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A. Low co-efficient of expansion

B. High co-efficient of expansion

C. High melting point

D. Both B. and (C)

631. Oil produced by solvent extraction________________?
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A. Has low free fatty acid content

B. Is odourless

C. Both A. & B.

D. Neither A. nor B.
632. Cement setting under water employs a/an _______________ process ?
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A. Oxidation

B. Decomposition

C. Reduction

D. Hydration
633. Sulphuric acid is mainly used in the _______________ industry ?
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A. Fertiliser

B. Steel

C. Paint

D. Paper