1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. In industrial nomenclature, alcohol means
A. Butyl alcohol
B. Propyl alcohol
C. Ethanol
D. Methyl alcohol
Answer : C

2. 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

3. The combustion reaction, C + O₂ = CO₂, is
A. Exothermic
B. Endothermic
C. Autocatalytic
D. None of these
Answer : A

4. Catalyst used during the manufacture of 'Vanaspati Ghee' is
A. Zinc
B. Nickel
C. Platinum
D. Copper
Answer : B

5. 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

6. Sulphur addition in soap is done to
A. Improve the soap texture
B. Cure pimples & dandruff
C. Fasten lather formation
D. Increase its cleansing action
Answer : B

7. Argon is the third largest constituent of air (followed by N₂ & O₂). Its percentage by volume in air is
A. 0.14
B. 0.34
C. 0.94
D. 1.4
Answer : C

8. Shaving soaps are
A. Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a lasting property
B. Metallic soaps compounded with frothing agents
C. High free alkali soaps having excess of cane sugar and alcohol
D. None of these
Answer : A

9. Sulphur removal by heating of pyrite ore in presence of air is called its
A. Reduction
B. Roasting
C. Calcination
D. Smelting
Answer : B

10. Favourable conditions for the liquefaction of gases in general are
A. High pressure & low temperature
B. Low pressure & high temperature
C. High pressure & high temperature
D. Low pressure & low temperature
Answer : A

11. 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

12. 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

13. Pick out the wrong statement.
A. Catalytic hydrogenation of carbon monoxide produces methyl alcohol
B. In nylon-6, the number 6 represents the total number of carbon atoms in the ring
C. Raw materials for DDT manufacture are benzene and chlorine
D. Ethanolamines are produced by using ammonia and ethylene oxide as raw material
Answer : C

14. Commercially ethylene is produced from naphtha by
A. Catalytic cracking
B. Catalytic dehydrogenation
C. Pyrolysis
D. Hydrocracking
Answer : D

15. Na2CO3 is called
A. Washing soda
B. Soda ash
C. Plaster of Paris
D. Calcite
Answer : B

16. 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

17. 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

18. Chrome tanning and vegetable tanning are done for
A. Light & heavy leather respectively
B. Heavy & light leather respectively
C. Both light & heavy leather
D. Neither light nor heavy leather
Answer : A

19. Trinitrotoluene (TNT), an explosive, is made by the nitration of
A. Nitrobenzene
B. Toluene
C. Nitrotoluene
D. Benzene
Answer : B

20. 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

21. Addition of calcium oxide to water produces
A. Exothermic heat
B. Hissing sound
C. Slaked lime
D. All (A), (B) & (C)
Answer : D

22. Neoprene is the trade name of
A. Polyurethane
B. Phenol formaldehyde
C. Polychlorophrene
D. Styrene-butadiene rubber
Answer : C

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

24. 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

25. Calcination of gypsum produces
A. Plaster of Paris
B. Salt cake
C. Nitre cake
D. Lime
Answer : A

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

27. Electric bulbs are made of __________ glass.
A. Jena
B. Flint
C. Crookes
D. Pyrex
Answer : B

28. Styrene is produced from ethyl benzene by the process of
A. Dehydrogenation
B. Oxidation
C. Alkylation
D. Dehydration
Answer : A

29. Reaction of calcium carbide with water produces a gas, which is used
A. As an illuminant
B. For metal cutting/welding
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

30. Oil is a/an
A. Mixture of glycerides
B. Mixture of glycerides of fatty acids
C. Solid at normal temperature
D. Ester of alcohols other than glycerine
Answer : B

31. Multistage catalytic converter is not used in the
A. Conversion of SO2 to SO3
B. NH3 synthesis reaction
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : B

32. Which of the following is used as a binding material in soap to improve soap texture?
A. Rosin
B. Borax
C. Benzyl acetate
D. Sodium carbonate
Answer : B

33. 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

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

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

36. Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.
A. CaO
B. MnO₂
C. ZnO
D. FeS
Answer : C

37. __________ of quicklime produces slaked lime.
A. Hydration
B. Dehydration
C. Hydrogenation
D. None of these
Answer : A

38. Esterification reaction produces
A. Detergent
B. Vanaspati
C. Soap
D. Mercaptans
Answer : C

39. Plasticisers are added to synthetic plastics to
A. Impart flexibility
B. Improve workability during fabrication
C. Develop new improved properties not present in the original resins
D. All (A), (B) and (C)
Answer : D

40. The compressive strength of cement should not be less than about 110Kg/cm² after three days & not less than 170Kg/cm² after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm²/gm.
A. 800
B. 1600
C. 4000
D. 8500
Answer : B

41. High purity nitrogen is used in
A. Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
B. Fire fighting purposes
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

42. Glauber's salt is chemically
A. Calcium sulphate
B. Potassium sulphate
C. Potassium chlorate
D. None of these
Answer : D

43. Temporary hardness of water can be removed by
A. Addition of alum (a coagulant)
B. Boiling
C. Filtration (through gravity sand filter)
D. Addition of lime
Answer : B

44. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
A. Diamine and the ring
B. Dibasic acid and the ring
C. Diamine and the dibasic acid
D. None of these
Answer : C

45. DDT stands for
A. Diethyl-diphenyl-trichloromethane
B. Dichloro-diphenyl-trichloromethane
C. diphenyl-dichloro-trichloromethane
D. Dichloro-diphenyl-trichloroethane
Answer : D

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

47. Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
A. L.D. converter
B. Blast furnace
C. Rotary kiln
D. Recuperator
Answer : D

48. Glycerine is a by-product of the __________ industry.
A. Soap
B. Detergent
C. Oil hydrogenation
D. Paint
Answer : A

49. An oil is converted into fat by its
A. Hydrogenation
B. Hydrolysis
C. Hydrocracking
D. Hydration
Answer : A

50. Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
A. 75
B. < 10
C. > 30
D. 50
Answer : B