1000+ Chemical Process MCQ for SSC CGL [Solved]

1. Impurities present in brine is normally removed by treatment with
A. NH₃ and CO₂
B. Lime and soda ash
C. Lime, ammonia and carbon
D. All (A), (B) and (C)
Answer : D

2. Reaction of an alcohol with organic acid is called the __________ reaction.
A. Saponification
B. Esterification
C. Neutralisation
D. Acidification
Answer : B

3. Which is a high grade pulp?
A. Rag pulp
B. Mechanical pulp
C. Sulphate pulp
D. Sulphite pulp
Answer : C

4. 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

5. Permanent hardness of water can be removed by
A. Boiling
B. Adding Ca(OH)₂
C. Boiling it with Na₂CO₃
D. None of these
Answer : C

6. Yellow phosphorus is transported under
A. Air
B. Water
C. Nitrogen
D. Helium
Answer : B

7. Calgon used in water treatment is chemically
A. Sodium phosphate
B. Sodium hexametaphosphate
C. Calcium phosphate
D. Tricresyl phosphate
Answer : B

8. Phthalic anhydride is used
A. In making PVC
B. As plasticisers
C. In insecticides manufacture
D. For making nylon-6
Answer : B

9. Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process?
A. NH3
B. NaCl
C. CaO
D. Coke
Answer : A

10. High temperature carbonisation of coal produces
A. Inferior coke compared to low temperature carbonisation
B. Less of gases compared to liquid products
C. Larger quantity of tar compared to low temperature carbonisation
D. None of these
Answer : D

11. Salt is added in the kettle during soap manufacture to separate
A. Soap from lye
B. Glycerine from lye
C. The metallic soap
D. The unsaponified fat from soap
Answer : A

12. 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

13. All enzymes are made of
A. Fats
B. Carbohydrates
C. Proteins
D. Amino acids
Answer : C

14. 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

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

16. __________ 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

17. The biochemical treatment applied to sewage effluents is a process of
A. Dehydration
B. Reduction
C. Oxidation
D. Polymerisation
Answer : C

18. The main use of HCl is in the
A. Drilling of petroleum wells and pickling of steel sheets
B. Manufacture of cationic detergent
C. Treatment of spent fuel of nuclear reactor
D. None of these
Answer : A

19. Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre.
A. Cutting
B. Fibrillation
C. Hydration
D. Strengthening
Answer : D

20. Ethyl alcohol cannot be produced
A. From waste sulphite substrate of paper mills
B. By Esterification and hydrolysis of ethylene
C. From molasses
D. None of these
Answer : D

21. Molecular weights of polymers are in the range of
A. 10² - 10²
B. 10⁵ - 10⁹
C. 10² - 10⁷
D. 10⁹ - 10¹¹
Answer : C

22. Dechlorination of treated water is necessary to
A. Remove residual turbidity
B. Reduce the bacterial load on filter
C. Control taste and odour
D. Remove chlorinous taste
Answer : D

23. The most reactive allotropic form of phosphorus is __________ phosphorus.
A. Red
B. Yellow
C. Violet
D. Black
Answer : B

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

25. Bio-degradable detergents
A. Can be readily oxidised
B. Pose problem in sewerage plant
C. Have an isoparaffinic structure
D. Should not be used as it spoils the cloth
Answer : A

26. 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

27. Sudden temperature fluctuation does not affect pyrex glass, because of its
A. Low co-efficient of expansion
B. High co-efficient of expansion
C. High melting point
D. Both (B) and (C)
Answer : A

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

29. Oils and fats are converted to soap in a process called
A. Hydrogenation
B. Esterification
C. Saponification
D. None of these
Answer : C

30. Carborundum consists mainly of
A. Bauxite
B. Silicon carbide
C. Boron carbide
D. Calcium carbide
Answer : B

31. 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

32. Hydrochloric acid is also known as
A. Oil of vitriol
B. Muriatic acid
C. Strong organic acid
D. Green acid
Answer : B

33. Wax is a
A. Mixture of glycerides
B. Mixture of esters of polyhydric alcohols excepting glycerine
C. Liquid at room temperature
D. Mixture of glycerides of fatty acids
Answer : B

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

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

36. Which of the following is an organometallic compound?
A. Isopropyl alcohol
B. Tetra-ethyl lead
C. Zeolite
D. Cumene
Answer : B

37. Riboflavin is a/an
A. Vitamin
B. Analgesic drug
C. Anaesthetics
D. Anti-malarial drug
Answer : A

38. Pick out the wrong statement.
A. Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action
B. Soap powder is prepared by mixing soap with hydrated sodium carbonate
C. Detergents differ from soaps in their action in hard water
D. Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc
Answer : D

39. 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

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

41. Raw material used in alcohol distilleries in India is
A. Molasses
B. Benzol
C. Methylated spirit
D. None of these
Answer : A

42. Pick out the wrong statement pertaining to nitric acid.
A. About 90% of nitric acid is manufactured by Ostwald's process
B. It is a strong mono basic acid which reacts with almost all the metals except noble metals
C. Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)
D. Arc process of nitric acid manufacture is economical as compared to Ostwald's process
Answer : D

43. Pick out the wrong statement pertaining to the soap manufacture.
A. Transparent soaps are made by cold process
B. Organic pigments are used as colouring materials in the soap manufacture
C. Both laundry as well as toilet soaps are manufactured by hot process
D. Colourless rosin is used in the manufacture of laundry soaps
Answer : A

44. A mineral is termed as 'ore', if
A. A metal can be economically extracted from it
B. It contains ? 40% metal
C. The metal present in it is costly
D. All (A), (B) and (C)
Answer : A

45. 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

46. Tall oil obtained as a by-product from the black liquor recovery is
A. A black, sticky & viscous liquid
B. Used in the manufacture of greases, emulsions & soaps
C. Composed mainly of rosin & fatty acids
D. All (A), (B) & (C)
Answer : D

47. Function of thinner in a paint is to
A. Accelerate the oxidation of oil
B. Prevent gelling of the paint
C. Suspend pigments & dissolve film forming materials
D. Form a protective film
Answer : C

48. Bakelite is
A. Same as Polytetrafluoroethylene (PTFE)
B. An inorganic polymer
C. Same as thermosetting phenol-formaldehyde
D. Not a polymer
Answer : C

49. 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

50. Stereospecific agents are exemplified by
A. Radiation
B. Supported metal oxide catalysts
C. Ziegler catalysts
D. All (A), (B) & (C)
Answer : D