1000+ Chemical Process Multiple Choice Question Answer [Solved]

1. Phenol formaldehyde is produced by condensation polymerisation. It is also known as
A. Teflon
B. Bakelite
C. Polyester
D. Nylon-66
Answer : B

2. 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

3. Starting material for the production of styrene butadiene rubber (SBR) is
A. Ethyl alcohol
B. Ethylene
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

4. Which of the following processes is absent in glass manufacturing process?
A. Sintering
B. Annealing
C. Shaping or forming
D. Melting
Answer : A

5. 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

6. 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

7. Bromine is used in the preparation of
A. Fire extinguishing compounds
B. Fire proofing agents
C. Dyes and antiknock compounds
D. All (A), (B) and (C)
Answer : D

8. 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

9. The difference between saponification value and acid value is
A. Called ester value
B. Always negative
C. Constant for all fatty oils
D. None of these
Answer : A

10. 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

11. More than 100 percent of __________ is present in oleum.
A. SO₃
B. H₂SO₄
C. H₂SO₃
D. SO₂
Answer : B

12. At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.
A. Independent of
B. Directly proportional to
C. Inversely proportional to
D. Proportional to the square of
Answer : A

13. Dacron is a
A. Condensation product of Hexamethylene diamine and adipic acid
B. Thermosetting material
C. Condensation product of dimethyl terephthalate and ethylene glycol
D. None of these
Answer : D

14. Thermal pyrolysis of ethylene dichloride produces
A. Trichloroethylene
B. Vinyl chloride
C. Ethanol amine
D. Ethylene oxide
Answer : B

15. Lurgi coal gasifier is a pressurised __________ bed reactor.
A. Moving
B. Fixed
C. Fluidised
D. Entrained
Answer : A

16. 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

17. Penicillin is made employing __________ fermentation process.
A. Continuous
B. Aerobic batch
C. Anaerobic batch
D. None of these
Answer : B

18. 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

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

20. Pick out the wrong statement.
A. Fibrillation of fibre during paper manufacture is done to develop the strength in paper
B. Alkali consumption in digestion/cooking of bamboo is measured in terms of permanganate number
C. Bagasse fibre contains both lignin & cellulose
D. Presence of sodium sulphate in pulp makes the pulp bleachability poor
Answer : D

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

22. Sodium carbonate (soda ash) is not used in the manufacture of
A. Fire extinguishers
B. Sugar
C. Baking powder
D. Detergents
Answer : D

23. During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
A. Increase the rate of absorption
B. Avoid corrosion
C. Reduce the cooling water circulation rate
D. None of these
Answer : B

24. Starting material for the production of butadiene in India is
A. Naphthalene
B. Benzol
C. Ethyl alcohol
D. Phthalic anhydride
Answer : C

25. Triple superphosphate is manufactured by reacting
A. Phosphate rock with phosphoric acid
B. Phosphate rock with sulphuric acid
C. Phosphate rock with nitric acid
D. Ammonium phosphate with phosphoric acid
Answer : A

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

27. 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

28. 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

29. Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?
A. High cost of mercury
B. High specific gravity of mercury
C. Non-availability of high purity mercury
D. Pollution of water stream by mercury
Answer : D

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

31. Which of the following is not present in bagasse fibre?
A. Cellulose
B. Lignin
C. Pentogens
D. None of these
Answer : D

32. __________ 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

33. Laboratory glass wares which reacts with hydrofluoric acid, are made of the __________ glass.
A. Lead
B. Borosilicate
C. Soda lime
D. Alkali silicate
Answer : B

34. Coke used for the production of calcium carbide should have
A. Low ash content
B. Low ignition temperature
C. High electrical resistivity
D. All (A), (B) and (C)
Answer : D

35. 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

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

37. 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

38. Anion exchanger is regenerated usually with
A. NaOH
B. H2SO4
C. Hydrazine
D. Alum solution
Answer : A

39. Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?
A. Depithing
B. Digestion
C. Bleaching
D. None of these
Answer : A

40. Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E (poly chloro tetra fluoro ethylene). It is also called
A. Polyurethane
B. Silicone
C. Teflon
D. Epoxy resin
Answer : C

41. Reverse osmosis is normally used for the
A. Separation of isotopes of uranium from gaseous uranium hexafluoride
B. Separation of helium from natural gas
C. Desalination of brackish water to produce potable (drinking) water
D. Purification of oxygen
Answer : C

42. 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

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

44. Main constituents of Portland cement are calcium aluminate and
A. Gypsum
B. Silicates
C. Sodium silicate
D. Carbonates
Answer : B

45. Starting material for the commercial production of ethyl alcohol in India is
A. Rice
B. Molasses
C. Fruit of Mahua tree
D. Maize
Answer : B

46. __________ is a thermosetting plastic.
A. Polyvinyl chloride
B. Polythene
C. Bakelite
D. Teflon
Answer : C

47. 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

48. The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
A. Dilute H₂SO₄
B. Oleum
C. Ultraviolet light
D. None of these
Answer : B

49. Concentration of sulphide ores is done usually by
A. Roasting
B. Smelting
C. Froth floatation
D. Electromagnetic separation
Answer : C

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