1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. Maleic anhydride is produced by catalytic oxidation of
A. Toluene
B. Ethyl alcohol
C. Naphthalene
D. Benzene
Answer : D

2. What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?
A. Cl₂ & Na
B. Cl₂ & H₂
C. O₂ & H₂
D. Cl₂, H₂ & NaOH solution
Answer : D

3. 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

4. Brackish water which contains mostly dissolved salt, can be purified by the __________ process.
A. Reverse osmosis
B. Sand filter
C. Lime soda
D. Permutit
Answer : A

5. Hydrogenation of edible vegetable oils
A. Is an exothermic reaction
B. Increases their melting point
C. Is done in presence of nickel catalyst
D. All (A), (B) and (C)
Answer : D

6. Parathion and Malathion are
A. Pesticides
B. Plasticisers for unsaturated polyesters
C. Pain-relieving drugs (analgesic)
D. Tranquilisers
Answer : A

7. Pick out the wrong statement.
A. Dry process is used for the manufacture of cement, when the raw material is blast furnace slag
B. Portland cement is made employing wet process
C. Gypsum is added to Portland cement to lengthen its setting time
D. None of these
Answer : D

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

9. 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

10. Paper pulp produced by Kraft/sulphate process is
A. Bleached easily
B. Dull white in color
C. Strong fibrous
D. Dark colored
Answer : C

11. The temperature in the calcium carbide furnace is __________ °C.
A. 200-300
B. 700-850
C. 2000-2200
D. 4000-4500
Answer : C

12. 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

13. Bitterns is a/an
A. Unsaturated fat
B. Starting material for the production of iodine
C. By-product of chlor-alkali industry
D. None of these
Answer : D

14. Which of the following is not required in the manufacture of soda ash by Solvay process?
A. Ammonia
B. Limestone
C. Nitric acid
D. None of these
Answer : C

15. Glauber's salt is chemically represented by
A. Na₂SO₄.10H₂O
B. CaCl(OCl)
C. CaSO₄.H₂O
D. (NH₄)₂SO₄
Answer : A

16. Silicone is a/an
A. Thermoplastic
B. Inorganic polymer
C. Monomer
D. None of these
Answer : B

17. Absorption of SO3 in 97% H2SO4 is
A. Exothermic
B. Endothermic
C. Not possible
D. None of these
Answer : A

18. 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

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

20. Nylon-66 is manufactured from
A. Hexamethylene diamine and adipic acid
B. Hexamethylene diamine and Maleic anhydride
C. Caprolactam
D. Dimethyl terephthalate and ethylene glycol
Answer : A

21. Pick out the wrong statement.
A. Kraft method of pulp manufacture can process all types of fibrous raw materials
B. Digestion time for bagasse is less than that for wood base materials
C. Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method
D. None of these
Answer : D

22. 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

23. In sulphate pulp manufacture, the pressure and temperature in the digestor is
A. 10 atm., 800 °C
B. 10 atm., 170-180°C
C. 1 atm., 170 - 180°C
D. 1 atm., 800°C
Answer : B

24. Oxygen is produced by fractionation of air using __________ process.
A. Linde's
B. Claude's
C. Either (A) or (B)
D. None of these
Answer : C

25. Presence of H₂S in raw water (to be chlorinated) results in the
A. Reduced softening capacity of zeolite
B. Increased dosage of chlorine to provide a disinfecting residual in the water
C. Easy removal of its hardness
D. None of these
Answer : B

26. Permanent hardness of water is due to the presence of calcium & magnesium
A. Bi-carbonates
B. Sulphates & chlorides
C. Carbonate
D. None of these
Answer : B

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

28. Direct conversion of chemical energy into electrical energy is done in a
A. Magnetohydrodynamic (MHD) generator
B. Fuel cell
C. Fast breeder reactor
D. None of these
Answer : B

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

30. Resistance to fusion of the refractory under a steady rising temperature condition is called
A. Spalling
B. Refractoriness
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

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

32. Economics of 'Solvay Process' depends upon the efficiency of
A. Carbonating tower
B. Ammonia recovery
C. Ammonia recovery and size of the plant
D. Ammoniation of salt solution
Answer : C

33. 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

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

35. Cellulose percentage in bamboo fibre is about
A. 10
B. 20
C. 50
D. 85
Answer : C

36. Permanent hardness of water can be removed by
A. Addition of soda ash to it
B. Treating it with zeolites
C. Passing it through sodium hexametaphosphate
D. All (A), (B), and (C)
Answer : D

37. Catalytic oxidation-dehydrogenation of methyl alcohol produces
A. Formaldehyde
B. Phenol
C. Acetone
D. Maleic anhydride
Answer : A

38. Production of one ton of dry paper pulp requires about __________ tons of bamboo or wood.
A. 1
B. 2.5
C. 5
D. 10
Answer : B

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

40. Commercial production of Vanaspati is done by __________ of edible vegetable oils.
A. Hydrogenation
B. Oxidation
C. Hydrolysis
D. Hydrocracking
Answer : A

41. Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ °C.
A. -53
B. -103
C. -183
D. -196
Answer : C

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

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

44. Deaeration of water in its treatment is necessary, as it
A. Minimises its turbidity
B. Helps in controlling its taste and odour
C. Minimises its corrosiveness
D. None of these
Answer : C

45. 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

46. High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to
A. Flocculate the impurities
B. Facilitate fast filtration
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C

47. Acetone is produced by catalytic dehydrogenation of
A. Phenol
B. Naphthalene
C. Isopropanol
D. Ethyl benzene
Answer : C

48. Polycaprolactam is commercially known as
A. Nylon-6
B. Nylon-66
C. Dacron
D. Rayon
Answer : A

49. __________ are added in lacquers to remove film brittleness and to improve adhereness.
A. Film forming materials
B. Plasticisers
C. Diluents
D. Solvents
Answer : B

50. Naphthalene is removed from coke oven gas by
A. Adsorbing on palladium
B. Absorbing in ethanolamine
C. Scrubbing with wash oil
D. Passing it through electrostatic precipitator
Answer : C