Chemical Process MCQ Solved Paper for NMAT

1. 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

2. Portland cement consists mainly of
A. CaO & SiO₂
B. SiO₂ & Al₂O₃
C. CaO & Al₂O₃
D. CaO & Fe₂O₃
Answer : A

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

4. Which of the following has sodium bicarbonate as its main constituent?
A. Baking soda
B. Baking powder
C. Washing soda
D. None of these
Answer : B

5. Alum [Al₂(SO₄)₃] is used as a coagulant in water treatment to remove
A. Colour
B. Turbidity
C. Bacteria
D. All (A), (B) and (C)
Answer : D

6. Pick out the wrong statement.
A. Cold rubber (SBR) is superior as compared to hot rubber (SBR)
B. Polymerisation temperature can modify the properties of SBR
C. Production of cold SBR employs lower pressure as compared to that of hot SBR
D. None of these
Answer : D

7. Blue vitriol is chemically
A. Copper sulphate
B. Ferrous sulphate
C. Copper nitrate
D. Aluminium sulphate
Answer : A

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

9. Pick out the correct statement.
A. A fat is converted into oil by its hydrogenation
B. There is no difference between a fat and an oil so far as its physical properties are concerned
C. All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms
D. Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content
Answer : C

10. Polymethyl methacrylate (PMMA) is known as
A. Bakelite
B. Teflon
C. Perspex
D. Nylon-6
Answer : C

11. Enzymes are organic catalysts used in the __________ reactions.
A. Chemical
B. Biochemical
C. Photochemical
D. Electrochemical
Answer : B

12. Phenol formaldehyde resin is used as an adhesive in making
A. Laminates
B. Card boxes
C. Furniture
D. Books
Answer : A

13. 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

14. Cooking liquor in case of sulphite process is
A. Sodium sulphite and sodium bisulphite
B. Magnesium sulphite and free SO2 in acid medium
C. Magnesium sulphate and magnesium bicarbonate
D. None of these
Answer : A

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

16. Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
A. Emulsification
B. Dispersion
C. Precipitation
D. Wetting
Answer : C

17. 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

18. Lubricating greases are a mixture of
A. Mineral oil, soap and additives
B. Mineral oil and metallic soap
C. Mineral oil and fatty oil
D. Fatty oil and metallic soap
Answer : A

19. Heating of __________ to 120°C, produces plaster of paris.
A. Blue vitriol
B. Gypsum
C. Calcium silicate
D. Calcium sulphate
Answer : B

20. The most economical pulp for the production of newsprint would be the __________ pulp.
A. Ground-wood
B. Sulphate
C. Sulphite
D. Semi-chemical
Answer : A

21. 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

22. Use of hydrated lime in water treatment
A. Before filtration, reduces the bacterial load on filters
B. After filtration, combats the corrosiveness of water due to the presence of O₂ & CO₂
C. Is to adjust the pH value
D. All (A), (B) and (C)
Answer : D

23. 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

24. 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

25. Pick out the wrong statement. Iodine value of an oil or fat is
A. The number of grams of iodine taken up by 100 gm of oil or fat
B. A measure of its unsaturation
C. Helpful in findings its adulteration & its suitability for making soap
D. Independent of the type of oil, whether it is drying or non-drying
Answer : D

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

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

28. 'Synthesis gas' meant for the synthesis of organic compound is a variable mixture of
A. N₂ & H₂
B. CO₂ & H₂
C. CO & H₂
D. C & H₂
Answer : C

29. Poly Tetrafluoroethylene (P.T.F.E.) is known as
A. Bakelite
B. Teflon
C. Celluloid
D. Dacron
Answer : B

30. Bordeaux mixture is a/an
A. Fertiliser
B. Inorganic fungicide
C. Insecticide
D. Explosive
Answer : B

31. Solvay process as compared to dual process
(i.e. modified Solvay process).
A. Can use low grade brine
B. Has less corrosion problems
C. Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl
D. Both (B) and (C)
Answer : D

32. __________ is the major constituent of the Portland cement.
A. Calcium carbonate
B. Calcium oxide
C. Tricalcium silicate
D. Calcium sulphate
Answer : C

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

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

35. Flexible foam (for mattresses) is usually made of
A. PVC
B. Silicone
C. Polyurethanes
D. Polyamides
Answer : C

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

37. Cumene (isopropyl benzene) is made by
A. Oxidation of naphthalene
B. Propylene alkylation of benzene
C. Polymerisation of a mixture of benzene & propylene
D. None of these
Answer : B

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

39. Liquefaction of gases cannot be done by
A. Exchange of heat with colder stream
B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
C. Merely compressing it beyond critical pressure
D. Adiabatic expansion against a piston or in a turbine
Answer : C

40. 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

41. 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

42. Fermentation is adversely affected by the
A. Presence of air
B. Absence of air
C. High concentration
D. Presence of ammonium salts
Answer : C

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

44. Penicillin is separated from fermented broth by
A. Extraction with amyl or butyl acetate
B. Ternary Azeotropic distillation
C. Evaporator in calandria
D. Extractive distillation
Answer : A

45. 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

46. Teflon is
A. Phenol formaldehyde
B. An inorganic polymer
C. Poly tetra-fluoro-ethylene (P.T.F.E.)
D. A monomer
Answer : C

47. Liquor poisoning generally occurs due to the presence of __________ in it.
A. Ethyl alcohol
B. Impurities
C. Methyl alcohol
D. Carbonic acid
Answer : C

48. Chloral is used in the manufacture of
A. DDT
B. BHC
C. Parathion
D. None of these
Answer : A

49. Saponification number of an oil or fat
A. Gives an idea about its molecular weight
B. Is inversely proportional to its molecular weight
C. Detects its adulteration
D. All (A), (B) & (C)
Answer : D

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