1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. Pick out the false statement pertaining to water treatment.
A. Aeration of water is effective in CO2 removal
B. The zeolite water softening process reduces the hardness of water by not more than 50%
C. Sodium sulphate or sodium carbonate do not cause hardness in water
D. Water with pH value less than 7, is acidic
Answer : B

2. Which of the following is not an insecticide?
A. Hydrocyanic acid
B. Nicotine
C. Sodium fluoride
D. Hexane
Answer : D

3. 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 : A

4. Boiling of water containing temporary hardness produces
A. CO₂
B. CaSO₄
C. CaHCO₃
D. None of these
Answer : A

5. Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of
A. 4 kgf/cm² & 500°C
B. 10 kgf/cm² & 1000°C
C. 40 kg/cm² & 200°C
D. 100 kgf/cm² & 500°C
Answer : A

6. Nylon-6 as compared to Nylon-66 is having higher
A. Hardness
B. Abrasion/resistance
C. Melting point
D. None of these
Answer : D

7. Polythene is a/an __________ polymerisation product.
A. Addition
B. Condensation
C. Thermosetting
D. None of these
Answer : A

8. Most commonly used rubber vulcanising agent is
A. Sulphur
B. Bromine
C. Platinum
D. Alumina
Answer : A

9. __________ is not a constituent of gun powder.
A. Carbon
B. Charcoal
C. Sulphur
D. Potassium nitrate
Answer : A

10. Varnish does not contain
A. Thinner
B. Pigment
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

11. Coke used for the production of calcium carbide should have
A. Low ash content
B. Low ignition temperature
C. High electrical resistivity
D. All (A), (B) and (C)
Answer : D

12. Paper grade bamboo contains about __________ percent cellulose.
A. 5
B. 20
C. 40
D. 60
Answer : A

13. Percentage of alcohol in beer may be around __________ percent.
A. 2-8
B. 18-23
C. 27-32
D. 1-4
Answer : A

14. Molecular weights of polymers are in the range of
A. 10² - 10²
B. 10⁵ - 10⁹
C. 10² - 10⁷
D. 10⁹ - 10¹¹
Answer : C

15. Wax is a
A. Mixture of glycerides
B. Mixture of esters of polyhydric alcohols excepting glycerine
C. Liquid at room temperature
D. Mixture of glycerides of fatty acids
Answer : B

16. Hydrocyanic acid (HCN) is used as an insecticide for
A. Controlling timber degradation by ants
B. Controlling poultry lice
C. Potato beetle
D. Citrus fruits
Answer : D

17. 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 : C

18. Polyvinyl chloride (PVC) is
A. A thermosetting material
B. A condensation polymerisation product
C. Made by employing emulsion polymerisation
D. None of these
Answer : C

19. In the manufacture of viscose rayon, the raw material used industrially is
A. Eucalyptus wood
B. Bamboo
C. Bagasse
D. Fine teak wood
Answer : D

20. An alkali metal salt of Palmitic acid is known as
A. Soap
B. Metallic soap
C. Detergent
D. Alkaloid
Answer : B

21. 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 : D

22. Which is the most efficient absorbent for SO₃ out of the following?
A. 20% oleum
B. 65% oleum
C. 78% H₂SO₄
D. 98% H₂SO₄
Answer : D

23. Electric bulbs are made of __________ glass.
A. Jena
B. Flint
C. Crookes
D. Pyrex
Answer : B

24. Which one of the following is not an elastomer?
A. Polyisoprene
B. Neoprene
C. Nitrile-butadiene
D. None of these
Answer : D

25. Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
A. Pyrolysis of oil
B. Sintering of porous catalyst
C. Hydrogen embrittlement
D. All (A), (B) and (C)
Answer : D

26. The process involved in converting rubber into a thin sheet or coating it on fabric is called
A. Extrusion
B. Mastication
C. Calendaring
D. Vulcanisation
Answer : C

27. Styrene (a monomer for the production of polystyrene) is commercially produced by
A. Catalytic dehydrogenation of ethyl benzene
B. Dehydration of ethyl alcohol followed by hydrogenation
C. Reacting ethylene oxide with acetaldehyde
D. Fermentation of starch
Answer : A

28. Raw materials used for producing __________ cement does not contain iron oxide.
A. Waterproof
B. Slag
C. White
D. Pozzolan
Answer : C

29. Sucrose is a disaccharide consisting of
A. Glucose and glucose
B. Glucose and fructose
C. Glucose and galactose
D. Fructose and galactose
Answer : B

30. Major component of flint glass is
A. Lead oxide
B. Silica
C. Alumina
D. Soda
Answer : A

31. Which of the following is an ore of iron?
A. Galena
B. Chalcopyrite
C. Hematite
D. Bauxite
Answer : C

32. Titanium dioxide is a/an __________ colour pigment.
A. White
B. Black
C. Yellow
D. Blue
Answer : A

33. Starting raw material for the manufacture of alum is
A. Alumina
B. Gypsum
C. Bauxite
D. Ammonium bicarbonate
Answer : C

34. Which of the following is not a raw material used for the manufacture of ordinary glass?
A. Iron oxide
B. Soda ash
C. Limestone
D. Silica
Answer : A

35. Producer gas consists mainly of
A. CO, CO₂ N₂, H₂
B. CO, H₂
C. H₂, CH₄
D. C₂H₂, CO₂, H₂
Answer : A

36. Calgon used in water treatment is chemically
A. Sodium phosphate
B. Sodium hexametaphosphate
C. Calcium phosphate
D. Tricresyl phosphate
Answer : B

37. Average sulphur content in Indian pyrites is about __________ percent.
A. 15
B. 35
C. 55
D. 70
Answer : B

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

39. 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

40. Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
A. 80
B. 90
C. 98
D. 100
Answer : C

41. Le-Blanc process is a primitive process for the manufacture of
A. Caustic soda
B. Soda ash
C. Bromine from sea water
D. Hydrochloric acid
Answer : B

42. Commercially ethylene is produced from naphtha by
A. Catalytic cracking
B. Catalytic dehydrogenation
C. Pyrolysis
D. Hydrocracking
Answer : D

43. More than 100 percent of __________ is present in oleum.
A. SO₃
B. H₂SO₄
C. H₂SO₃
D. SO₂
Answer : B

44. Which of the following is a constituent of coffee?
A. Caffeine
B. Nicotine
C. Calgon
D. Lignin
Answer : A

45. 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 : D

46. Pick out the exothermic reaction out of the following:
A. C + H₂O = CO + H₂
B. CaC₂ + H₂O = Ca(OH)₂ + C₂H₂
C. MgCO₃ = MgO + CO₂
D. All (A), (B) and (C)
Answer : B

47. Chemical name of Grignard reagent is
A. Sodium thiosulphate
B. Ethyl magnesium chloride
C. Sodium sulphite
D. Sodium bicarbonate
Answer : B

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

49. The manufacture of Kraft pulp is done by a/an __________ process.
A. Alkaline
B. Acidic
C. Neutral
D. None of these
Answer : A

50. Which of the following is an yellow pigment?
A. Titanium dioxide
B. Ferrous sulphate
C. Lead chromates
D. Zinc sulphides
Answer : C