1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. Graphite is a/an
A. Electrical insulator
B. Allotrope of carbon
C. Moderator used in nuclear reactor
D. Both (B) and (C)
Answer : D

2. Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively
A. V₂O₅ & Cr₂O₃.
B. Oxides of nitrogen & Cr₂O₃
C. V₂O₅ on a porous carrier & oxides of nitrogen
D. Oxides of nitrogen & V₂O₅ on a porous carrier
Answer : D

3. Naphthalene is removed from coke oven gas by
A. Adsorbing on palladium
B. Absorbing in ethanolamine
C. Scrubbing with wash oil
D. Passing it through electrostatic precipitator
Answer : C

4. The combustion reaction, C + O₂ = CO₂, is
A. Exothermic
B. Endothermic
C. Autocatalytic
D. None of these
Answer : A

5. Silicone is a/an
A. Thermoplastic
B. Inorganic polymer
C. Monomer
D. None of these
Answer : B

6. Fermentation of molasses to produce ethyl alcohol is done at __________ °C.
A. 20 - 30
B. < - 5
C. 100 - 150
D. 250 - 300
Answer : A

7. Phenol formaldehyde is produced by condensation polymerisation. It is also known as
A. Teflon
B. Bakelite
C. Polyester
D. Nylon-66
Answer : B

8. Chemical name of aspirin (an analgesic drug) is
A. Acetylsalicylic acid
B. Nictonic acid
C. Calcium acetate
D. Methyl salicylate
Answer : A

9. Catalyst used in the oxidation of benzene to produce Maleic anhydride is
A. V₂O₅
B. Pt
C. Ni
D. Cr
Answer : A

10. Blue colour is imparted to glass by the addition of
A. FeSO₄
B. PbO
C. CaO
D. NaOH
Answer : C

11. Pick out the wrong statement pertaining to the soap manufacture.
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
Answer : A

12. CO & H₂ are the constituents of
A. Producer gas
B. Water gas
C. Coke oven gas
D. All (A), (B) and (C)
Answer : D

13. Bleaching of paper pulp is done with
A. Activated clay
B. Bromine
C. Chlorine or chlorine dioxide
D. Magnesium sulphite
Answer : C

14. Sodium chloride content in sea water is about __________ gms/litre.
A. 2
B. 10
C. 25
D. 50
Answer : C

15. Lime and soda ash are added to water to remove
A. Bicarbonates & sulphates of calcium and magnesium
B. Undesirable taste and odour
C. Bacteria
D. Its corrosiveness
Answer : A

16. Calcination of limestone is not done in a __________ kiln for producing lime.
A. Vertical shaft
B. Rotary
C. Fluidised bed
D. Fixed bed
Answer : D

17. Sudden temperature fluctuation does not affect pyrex glass, because of its
A. Low co-efficient of expansion
B. High co-efficient of expansion
C. High melting point
D. Both (B) and (C)
Answer : A

18. Pasteurisation of milk means
A. Removal of fatty and albuminous substance from it
B. Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
C. Inhibiting the growth of micro-organisms without killing them
D. None of these
Answer : B

19. Common salt is generally not produced commonly by __________ method from brine.
A. Freeze drying
B. Electrolytic
C. Solar evaporation
D. Vacuum evaporation
Answer : A

20. __________ is produced using Polycondensation reaction.
A. Polythene
B. Phenol formaldehyde
C. Poly vinyl chloride
D. None of these
Answer : B

21. Industrial production of chloroform requires acetone and
A. Phosgene
B. Calcium hypochlorite
C. Chlorine
D. Ammonium chloride
Answer : B

22. Separation of fresh water from sea water can be done by the __________ operation.
A. Osmosis
B. Reverse osmosis
C. Absorption
D. Adsorption
Answer : B

23. Chemical formula of oleum is
A. H₂SO₃
B. H₂SO₄
C. H₂S₂O₇
D. H₂SO₇
Answer : C

24. Free alkali in a toilet soap is __________ that in a laundry shop.
A. Less than
B. More than
C. Same
D. None of these
Answer : A

25. H2S is scrubbed from refinery gases by absorption using
A. Dilute H₂SO₄
B. Ethanol amine
C. Chilled water
D. Tri-butyl phosphate
Answer : B

26. Which of the following is not responsible for causing permanent hardness of water?
A. Ca(HCO₃)₂
B. CaCl₂
C. MgCl₂
D. None of these
Answer : A

27. Neoprene is a
A. Monomer
B. Synthetic rubber
C. Polyester
D. None of these
Answer : B

28. SO2 is bubbled through hot sugar cane juice to
A. Act as an acidifying agent
B. Increase its concentration
C. Increase the amount of molasses
D. Increase the crystal size
Answer : A

29. __________ acid is the main constituent of cotton seed oil.
A. Acetic
B. Linoleic
C. Palmitic
D. Oleic
Answer : B

30. __________ is an ore of lead.
A. Quartz
B. Galena
C. Siderite
D. Chalcopyrite
Answer : B

31. 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.
A. < 0
B. 10-30
C. 250-280
D. 500-600
Answer : B

32. Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have
A. High electrical insulation properties
B. Sharp melting points
C. Low co-efficient of thermal expansion
D. Compressive strength much greater than their tensile strengths
Answer : B

33. Contact process of sulphuric acid manufacture
A. Yields acid of higher concentration than chamber process
B. Yields acids of lower concentration than chamber process
C. Is obsolete
D. Eliminates absorber
Answer : A

34. 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 : C

35. Fluorescent dyes are added in detergents to
A. Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
B. Attain distinctiveness from other brands
C. Act as tarnish inhibitor for metals like German silver
D. None of these
Answer : A

36. Raw material used in alcohol distilleries in India is
A. Molasses
B. Benzol
C. Methylated spirit
D. None of these
Answer : A

37. Cellulose percentage in bamboo fibre is about
A. 10
B. 20
C. 50
D. 85
Answer : C

38. Which form of sulphur is the most stable at room temperature?
A. Plastic
B. Monoclinic
C. Rhombic
D. Flowers of sulphur
Answer : C

39. The most widely used coagulant for removing suspended impurities from water is
A. Bleaching powder
B. Chlorine
C. Calcium sulphate
D. Alum
Answer : D

40. Pick out the wrong statement.
A. Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%
B. Contact process of sulphuric acid manufacture produces pure acid of concentration ? 98%
C. 75% oleum can be produced by distillation of 20% oleum
D. Contact process of sulphuric acid manufacture uses nickel as the catalyst
Answer : D

41. 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 : A

42. Linde process of gas liquefaction employs
A. Exchange of heat with colder stream
B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
C. Adiabatic expansion against a piston or in a turbine
D. Merely compressing the gas beyond its critical pressure
Answer : B

43. Which of the following sugars is the sweetest?
A. Glucose
B. Fructose
C. Sucrose
D. Lactose
Answer : B

44. Viscose rayon
A. Cannot be made from sulphite pulp
B. Utilises H₂SO₄, NaOH and CS₂ during its manufacture
C. Cannot yield textile grade fibre
D. None of these
Answer : B

45. Dehydrogenation of ethyl benzene produces
A. Styrene
B. Naphthalene
C. Phenol
D. Benzoic acid
Answer : A

46. Kaolin is a/an
A. Refractory material
B. Synthetic resin
C. Artificial abrasive
D. Blue pigment
Answer : A

47. Starting raw material for the manufacture of Maleic anhydride is
A. n-butene
B. Benzene
C. Either (A) or (B)
D. Neither (A) nor (B)
Answer : C

48. Caprolactam (a raw material for nylon-6 manufacture) is produced from
A. Phenol
B. Naphthalene
C. Benzene
D. Pyridine
Answer : C

49. Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
A. Brighten the faint images
B. Remove metallic silver
C. Convert silver chloride to silver
D. Remove unexposed silver halide
Answer : D

50. Soap cannot be used with hard water, because
A. Hard water contains sulphate
B. They form insoluble calcium soaps which precipitate
C. They attract back the removed dirt
D. None of these
Answer : B