1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to
A. Adjust the pH of the syrup
B. Remove the coloring matter from the syrup
C. Reduce the viscosity of the syrup
D. Improve the rate of crystallisation of sugar
Answer : A

2. Which of the following is a detergent?
A. Benzene hexachloride
B. Alkyl benzene sulphonate
C. Polytetrafluoroethylene
D. Cellulose nitrate
Answer : B

3. Baking soda is chemically represented by
A. Na₂CO₃
B. NaHCO₃
C. Na₂CO₃.H₂O
D. Na₂CO₃.10H₂O
Answer : B

4. In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed:
A. Furnace ? converter ? absorber
B. Furnace ? evaporator ? absorber
C. Furnace ? converter ? evaporator
D. Converter ? furnace ? absorber
Answer : A

5. 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

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

7. Which of the following is a disaccharide?
A. Sucrose
B. Glucose
C. Starch
D. Maltose
Answer : A

8. Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
A. Chromium
B. Arsenic
C. Copper
D. Manganese
Answer : C

9. Phenolic antiseptics are added in the __________ soap.
A. Shaving
B. Medicated
C. Metallic
D. Transparent
Answer : B

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

11. Bleaching action of bleaching powder is due to its __________ properties.
A. Reducing
B. Oxidising
C. Disinfecting
D. None of these
Answer : B

12. Yellow glycerine is made into white, using
A. Activated carbon
B. Diatomaceous earth
C. Bauxite
D. Bentonite
Answer : A

13. During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as
A. It is very corrosive at elevated temperature
B. Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
C. It decomposes on further increasing the temperature
D. None of these
Answer : B

14. 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

15. 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

16. Claude process of gas liquefaction employs
A. Merely compression of gas beyond its critical pressure
B. Joule-Thomson expansion cooling
C. Heat exchange with colder stream
D. Adiabatic expansion against a piston or in a turbine
Answer : D

17. Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
A. 25
B. 60-70
C. 150-200
D. 250-300
Answer : B

18. Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to
A. Reduce its viscosity
B. Increase its viscosity
C. Reduce the variation in its viscosity with temperature
D. Increase the variation in its viscosity with temperature
Answer : C

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

20. Raw materials for 'Solvay Process' for manufacture of the soda ash are
A. Salt, limestone and coke or gas
B. Ammonia, salt and limestone
C. Ammonia limestone and coke
D. None of these
Answer : A

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

22. The major use of butadiene is
A. As a plasticiser for unsaturated polyester
B. In the manufacture of synthetic rubber
C. As an anti-skinning agent in paint
D. None of these
Answer : B

23. Hydrogenation of oil does not
A. Remove double bonds
B. Raise its melting point
C. Improve its resistance to oxidation
D. None of these
Answer : D

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

25. 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

26. Alkylbenzene sulfonate (ABS) is a
A. Detergent
B. Rubber
C. Pesticide
D. Polyester
Answer : A

27. Fat dispersed in water is exemplified by
A. Colloids
B. Gel
C. Butter
D. Emulsion
Answer : C

28. Which of the following is a detergent?
A. Fatty alcohol
B. Alkyl benzene sulphonate (ABS)
C. Fatty acids
D. Methylene chloride
Answer : B

29. Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.
A. 10
B. 25
C. 50
D. 98
Answer : A

30. 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

31. 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

32. CaCl(OCl) is the chemical formula of
A. Hypo
B. Bleaching powder
C. Plaster of Paris
D. Aqua regia
Answer : B

33. Chemical formula of 'salt cake' is
A. Na₂SO₄
B. CaSO₄
C. MgSO₄
D. BaSO₄
Answer : A

34. Catalytic oxidation of toluene produces
A. Styrene
B. Phenol
C. Benzene
D. Tri-nitro-toluene
Answer : B

35. Pick out the wrong statement.
A. High early strength cement are made from materials having high silica to lime ratio
B. The function of gypsum in cement is to enhance its initial setting rate
C. Acid resistant cements are known as silicate cement
D. Major component of greyish Portland cement is tricalcium silicate
Answer : A

36. Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.
A. 10
B. 25
C. 50
D. 98
Answer : C

37. The main use of HCl is in the
A. Drilling of petroleum wells and pickling of steel sheets
B. Manufacture of cationic detergent
C. Treatment of spent fuel of nuclear reactor
D. None of these
Answer : A

38. Nitrile rubber is produced by the polymerisation of
A. Acrylonitrile and butadiene
B. Acrylonitrile and styrene
C. Isobutylene and isoprene
D. None of these
Answer : A

39. Rotary kiln is not involved in the production of
A. Cement
B. Lime from limestone
C. Slaked lime from quick lime
D. None of these
Answer : C

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

41. Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of
A. Collagen
B. Tannin
C. Molasses
D. Carbohydrate
Answer : A

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

43. The basic difference between vegetable oils and fats is in their
A. Density
B. Chemical properties
C. Physical state
D. Composition
Answer : C

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

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

46. Margarine is a/an
A. Fat
B. Explosive
C. Plasticiser
D. Rocket propellant
Answer : A

47. The catalyst used in the manufacture of DDT is
A. Alumina
B. Silica
C. 20% oleum
D. Aluminium chloride
Answer : C

48. 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 : A

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

50. Antibiotic
A. Inhibits/destroys the growth of microorganisms
B. Is used as a pain reliever
C. Is an antimalarial
D. Is an anaesthetic
Answer : A