1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. Tall oil obtained as a by-product from the black liquor recovery is
A. A black, sticky & viscous liquid
B. Used in the manufacture of greases, emulsions & soaps
C. Composed mainly of rosin & fatty acids
D. All (A), (B) & (C)
Answer : D

2. The major constituents of glass are
A. Lime, clay and soda ash
B. Sand, lime and soda ash
C. Silica, alumina and clay
D. Silica, alumina and soda ash
Answer : B

3. Molasses is the starting material for the production of
A. Alcohol
B. Essential oil
C. Fatty acids
D. Massecuite
Answer : A

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

5. Sucrose content in cane sugar may be around __________ percent.
A. 50
B. 70
C. 95
D. 80
Answer : C

6. Phenol is mainly used
A. To produce benzene
B. To produce phenol formaldehyde
C. To produce polyester resin
D. As a plasticiser for unsaturated polyester
Answer : B

7. Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
A. Nickel
B. Vanadium
C. Alumina
D. Iron
Answer : B

8. With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide
A. Increases
B. Increases linearly
C. Decreases
D. Decreases linearly
Answer : C

9. __________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
A. Chlorine
B. Ammonium chloride
C. Sodium carbonate
D. Sodium bi-carbonate
Answer : A

10. The end bleaching agent used to move last traces of colour bodies from the pulp is
A. Chlorine dioxide (ClO₂)
B. MgO
C. SO₂ gas
D. Mercaptans
Answer : A

11. In Kraft process of paper manufacture, white cooking liquor consists of caustic soda
A. Sodium sulphide & sodium carbonate
B. Sodium sulphite & sodium carbonate
C. Sodium sulphite & sodium sulphide
D. None of these
Answer : A

12. The main product of high temperature carbonisation of coal is
A. Coke
B. Ammonia
C. Tar
D. Phenol
Answer : A

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

14. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically
A. Cyclo trimethylene trinitramine
B. Trinitro resorcinol
C. Cyclo tetramethylene tetranitramine
D. Trinitrobenzene
Answer : A

15. Dacron (or Terylene) fibres as compared to nylon fibres have
A. Better heat & acid resistant properties
B. Poorer resistance to alkalis
C. Poorer dyeability
D. All (A), (B) and (C)
Answer : D

16. __________ process is used for producing soda ash.
A. Chamber
B. Chance
C. Tromp
D. Solvay
Answer : D

17. Chemical formula of BHC, which is an insecticide is
A. C₆H₆Cl₆
B. C₆Cl₆
C. C₆H₅Cl
D. C₆H₄Cl₂
Answer : B

18. Presence of carbonaceous matter in the sewage
A. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
B. Reduces sulphate ions to sulphides causing obnoxious smell
C. Increases the quantity of chlorine used for its purification
D. All (A), (B) and (C)
Answer : D

19. Pick out the wrong statement.
A. Conversion of SO₂ to SO₃ in Monsanto-4 pass converter is about 98%
B. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide
C. Vitriol oil is nothing but technical sulphuric acid
D. Decomposition of sulphuric acid on heating does not start before its boiling
Answer : D

20. Lindane is
A. Not a fumigant
B. BHC (Benzene Hexachloride) containing 99% ?-isomer
C. A by-product of BHC manufacture
D. Both (B) and (C)
Answer : B

21. Bromine content in sea water may be around __________ ppm.
A. 70
B. 640
C. 1875
D. 2500
Answer : A

22. Main constituent of limestone is
A. CaCO₃
B. MgCO₃
C. Na₂CO₃
D. CaSO₄
Answer : A

23. All enzymes are made of
A. Fats
B. Carbohydrates
C. Proteins
D. Amino acids
Answer : C

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

25. Sea weeds are an important source of
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Answer : D

26. Dry ice (solidified CO₂) is used for the
A. Storage & shipment of frozen foods and ice-creams
B. Liquefaction of permanent gases
C. Liquefaction of natural gas
D. None of these
Answer : A

27. Hydrazine is largely used
A. As a starting material for 'hypo'
B. In photographic industry
C. As rocket fuel
D. In printing industry
Answer : C

28. 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

29. 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 : A

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

31. Extraction of __________ employs an electrolytic process.
A. Aluminium
B. Silver
C. Copper
D. All (A), (B) and (C)
Answer : A

32. Sucrose content in the raw juice extracted from sugar cane is about __________ percent.
A. 1 - 2
B. 15 - 20
C. 50 - 60
D. 80 - 85
Answer : B

33. Vanillin is a type of
A. Anti-pyretic drug
B. Food preservative
C. Flavour
D. Dye
Answer : C

34. The difference between saponification value and acid value is
A. Called ester value
B. Always negative
C. Constant for all fatty oils
D. None of these
Answer : A

35. Penicillin is made employing __________ fermentation process.
A. Continuous
B. Aerobic batch
C. Anaerobic batch
D. None of these
Answer : B

36. Zeolite is a/an
A. Naturally occuring clay which is capable of exchanging cations
B. Abrasive material
C. Catalyst used in shift conversion
D. None of these
Answer : A

37. 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

38. Permanent hardness of water can be removed by
A. Simply boiling
B. Adding alum
C. Passing it through cation & anion exchangers
D. All (A), (B) and (C)
Answer : C

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

40. Phosphate rock is a raw material for the manufacture of
A. Phosphoric acid
B. Phosphorous
C. Superphosphates
D. All (A), (B) and (C)
Answer : D

41. Acrylonitrile is mainly used in the __________ industry.
A. Polymer
B. Printing
C. Dyeing
D. Photographic
Answer : C

42. Nylon-6 is a
A. Polyamide
B. Thermosetting resin
C. Polyester
D. None of these
Answer : A

43. __________ of rubber decreases after its vulcanisation.
A. Resistance to the action of organic solvent
B. Tackiness
C. Maximum service temperature
D. Tensile strength
Answer : B

44. Glycerine is recovered from lye by
A. Evaporation followed by vacuum distillation
B. Liquid extraction technique
C. Extractive distillation technique
D. None of these
Answer : A

45. Which of the following paper does not require a filler during manufacture?
A. Bond paper
B. Writing paper
C. Blotting paper
D. Coloured paper
Answer : C

46. Enzymes are
A. Proteins with high molecular weight (around 10,000)
B. Derived from living organisms
C. Catalyst for temperature sensitive reactions
D. All (A), (B) and (C)
Answer : D

47. Chalcopyrite is the main ore of
A. Copper
B. Lead
C. Tin
D. Iron
Answer : A

48. Good quality of edible salt is obtained from brine by the process of
A. Solar evaporation
B. Vacuum evaporation
C. Freeze drying
D. Electrolysis
Answer : B

49. Superior quality laboratory apparatus is made of the __________ glass having low thermal coefficient of expansion & high chemical resistance.
A. Flint
B. Soda
C. Pyrex
D. Potash
Answer : C

50. Pick out the wrong statement.
A. Pasteurisation of milk involves moderate heating followed by cooling
B. Bakeries and breweries make use of yeasts
C. Enzyme is a complex nitrogenous compound
D. Oils and fats are alkaloids
Answer : D