Chemical Process MCQ Solved Paper for LIC AAO

1. The noble gas which occurs most abundantly in the atmosphere is
A. Helium
B. Neon
C. Krypton
D. Argon
Answer : D

2. Which of the following coals has the highest calorific value?
A. Lignite
B. Sub-bituminous
C. Anthracite
D. Peat
Answer : C

3. The chamber process is
A. Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
B. Non-catalytic and operates only on pyrites
C. A batch process for directly producing high strength (98 to 100%) H₂SO₄
D. None of these
Answer : D

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

5. 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

6. 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

7. __________ is used as a flux in the smelting of copper ore like chalcopyrite.
A. Coke breeze
B. Lime powder
C. Silica/quartz
D. Dolomite
Answer : C

8. Mercury cells for caustic soda manufacture, compared to diaphragm cells
A. Require lower initial investment
B. Require more power
C. Produce lower concentration NaOH
D. None of these
Answer : D

9. 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

10. Essential oils are usually obtained using
A. Steam distillation
B. Extractive distillation
C. Solvent extraction
D. Leaching
Answer : D

11. Litharge is
A. Lead oxide
B. Zinc oxide
C. Zinc sulphide
D. Cellulosic photographic material
Answer : A

12. Vulcanisation of rubber
A. Decreases its tensile strength
B. Increases its ozone & oxygen reactivity
C. Increases its oil & solvent resistance
D. Converts its plasticity into elasticity
Answer : D

13. Which of the following is not a food additive?
A. Citric acid
B. Invertage
C. Benzoyl peroxide
D. Ammonium chloride
Answer : D

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

15. Which of the following impurities in feed water for high pressure boiler is the most detrimental?
A. Silica
B. Dissolved oxygen
C. Suspended salt
D. Dissolved salt
Answer : A

16. Higher viscosity index of a lubricating oil denotes
A. Less changes in fluidity of oil with temperature
B. Substantially high change in fluidity of oil with temperature
C. Its unsuitability under varying temperature conditions
D. None of these
Answer : A

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

18. Which of the following is an endothermic reaction?
A. Absorption of SO₃ in 98% H₂SO₄
B. C + H₂O = CO + H₂
C. Thermal dissociation of iron pyrites
D. Both (B) and (C)
Answer : D

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

20. Molecular weight of plastics ranges from
A. 5000 to 10000
B. 20000 to 250000
C. 500 to 5000
D. 106 to 109
Answer : B

21. 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

22. Ethanol amine is produced using ammonia and
A. Ethyl benzene
B. Ethylene oxide
C. Ethanol
D. Ethane
Answer : B

23. 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

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

25. Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate
A. Is prone to thermal decomposition
B. Has high water solubility and is unstable
C. Is soluble in ammonium chloride and potassium chloride solution
D. All (A), (B) and (C)
Answer : C

26. Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
A. Calcium sulphate
B. Sodium chloride
C. Sodium sulphate
D. Magnesium chloride
Answer : B

27. The yield of tar from high temperature carbonisation of dry coal is about __________ percent.
A. 3
B. 12
C. 22
D. 0.3
Answer : A

28. The purpose of tanning in leather industry is to
A. Stiffen the leather
B. Smoothen the leather
C. Make it flexible
D. Impart water resistance
Answer : A

29. Black liquor is converted into white liquor by
A. Evaporation and burning the concentrate followed by causticisation of products
B. Multi-effect evaporation only
C. Selective liquid extraction
D. Extractive distillation
Answer : A

30. Thermosetting plastic materials
A. Can be repeatedly melted
B. Is useful for melt casting
C. Cannot be melted after forming
D. Is useful for spinning
Answer : C

31. Roasting of metallurgical ores is done mainly to
A. Dehydrate it
B. Sinter the ore
C. Remove CO₂ & H₂O
D. Remove arsenic & sulphur
Answer : D

32. A mixture of chlorine & sodium bromide acts as a/an
A. Insecticides
B. Analgesic drug
C. Fire retardant
D. Hydrogenation catalyst
Answer : C

33. Widely used method for the conditioning of boiler feed water is the
A. Cold lime process
B. Coagulation
C. Hot-lime soda process
D. Sequestration
Answer : C

34. __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
A. Pyrex
B. Soda lime
C. Lead
D. High silica
Answer : A

35. __________ 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

36. 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

37. Fusel oil is a/an
A. Essential oil
B. Extract from medicinal herbs
C. Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
D. None of these
Answer : C

38. In contact process, SO₃ is absorbed in 97% H₂SO₄ and not in water, because
A. SO₃ gas is sparingly soluble in water
B. Water forms an acid mist, which is difficult to absorb
C. The purity of acid is affected
D. Scale formation in the absorber is to be avoided
Answer : B

39. 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

40. Which of the following is an explosive?
A. Nitro-glycerine
B. Trinitrotoluene (TNT)
C. Cellulose nitrate
D. All (A), (B), and (C)
Answer : D

41. Trinitro-toluene (TNT) is
A. Used in glycerine manufacture
B. An explosive
C. Used in dye manufacture
D. None of these
Answer : B

42. Low temperature carbonisation of coal takes place at __________ °C.
A. 300
B. 1100
C. 700
D. 900
Answer : C

43. 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

44. 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

45. 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

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

47. __________ acid is an unsaturated fatty acid.
A. Palmitic
B. Oleic
C. Stearic
D. Oxalic
Answer : B

48. At a given temperature, the equilibrium yield of SO3 obtained from the oxidation of SO2 is proportional to (where, P = pressure of the system).
A. P
B. ?P
C. P²
D. 1/P
Answer : B

49. Viscose rayon is chemically
A. Cellulose nitrate
B. Regenerated cellulose nitrate
C. Cellulose acetate
D. Regenerated cellulose acetate
Answer : D

50. Lithophane is
A. Explosive
B. White lead
C. Filter aid
D. ZnS (white pigment)
Answer : D