Chemical Process MCQ Solved Paper for UPSC CDS

1. The gasification reaction represented by, C + H₂O = CO + H₂, is a/an __________ reaction.
A. Exothermic
B. Endothermic
C. Catalytic
D. Autocatalytic
Answer : B

2. Main constituents of cotton fiber is
A. Lignin
B. Cellulose
C. Starch
D. Gelatine
Answer : B

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

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

5. Hydrophilic group of a soap or detergent solution is
A. Water hating
B. Soil loving
C. Water loving
D. None of these
Answer : C

6. Fluorescent dyes are added in detergents to
A. Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
B. Attain distinctiveness from other brands
C. Act as tarnish inhibitor for metals like German silver
D. None of these
Answer : A

7. Nitro-glycerine absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as controlled explosive called dynamite. The raw material used for its manufacture are glycerine, nitric acid and
A. Sulphuric acid
B. Phosphoric acid
C. Hydrochloric acid
D. Hydrofluoric acid
Answer : A

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

9. 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

10. Solvent used for extraction of oil is
A. Hexane
B. Methyl ethyl ketone
C. Furfural
D. None of these
Answer : A

11. Hard water
A. Does not affect the lather formation by soap
B. Is not unfit for drinking purpose
C. Pollutes the water stream
D. All (A), (B) and (C)
Answer : B

12. Unsaturated oils compared to saturated oils have
A. Lower melting point & higher reactivity to oxygen
B. Higher melting point & higher reactivity to oxygen
C. Lower melting point & lower reactivity to oxygen
D. Higher melting point & lower reactivity to oxygen
Answer : A

13. Rosin soap is added during paper manufacture to
A. Impart adhesive properties
B. Improve opacity
C. Impart resistance to penetration by liquids
D. None of these
Answer : C

14. 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

15. Inversion of sucrose produces
A. Fructose
B. Glucose
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

16. Carbon disulphide is mainly used in the production of
A. Viscose rayon
B. Corundum
C. Plasticiser for unsaturated polyester
D. Paints
Answer : A

17. Deacon's method is used for the manufacture of
A. Glauber's salt
B. Common salt
C. Chlorine
D. Graphite electrode
Answer : C

18. Soaps remove dirt by
A. Increasing the surface tension
B. Decreasing wettability
C. Supplying hydrophilic group
D. None of these
Answer : D

19. 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

20. __________ process is used for producing soda ash.
A. Chamber
B. Chance
C. Tromp
D. Solvay
Answer : D

21. CaSO4 . ½H₂O is known as
A. Blue vitriol
B. Plaster of Paris
C. Gypsum
D. Zeolite
Answer : B

22. 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

23. Synthesis gas is a mixture of
A. CO and H₂
B. N₂ and H₂
C. H₂, CH₄ and CO
D. CO₂ and H₂
Answer : A

24. A good quality coal should have
A. Low fusion point of ash
B. High ash content
C. High sulphur content
D. None of these
Answer : D

25. Black liquor is converted into white liquor by
A. Evaporation and burning the concentrate followed by causticisation of products
B. Multi-effect evaporation only
C. Selective liquid extraction
D. Extractive distillation
Answer : A

26. The most widely used coagulant for removing suspended impurities from water is
A. Bleaching powder
B. Chlorine
C. Calcium sulphate
D. Alum
Answer : D

27. Fat splitting catalyst is
A. CaCO₃
B. ZnO
C. Al₂O₃
D. Fe
Answer : B

28. Bromine content in sea water may be around __________ ppm.
A. 70
B. 640
C. 1875
D. 2500
Answer : A

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

30. 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

31. In the manufacture of viscose rayon, the raw material used industrially is
A. Eucalyptus wood
B. Bamboo
C. Bagasse
D. Fine teak wood
Answer : D

32. The major constituent of black liquor generated during paper manufacture is sodium
A. Sulphate
B. Carbonate
C. Hydroxide
D. Bi-carbonate
Answer : B

33. Alcohol percentage in molasses may be around
A. 10
B. 40
C. 70
D. 85
Answer : B

34. 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

35. 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

36. Linde process of gas liquefaction employs
A. Exchange of heat with colder stream
B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
C. Adiabatic expansion against a piston or in a turbine
D. Merely compressing the gas beyond its critical pressure
Answer : B

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

38. Blue colour is imparted to glass by the addition of
A. FeSO₄
B. PbO
C. CaO
D. NaOH
Answer : C

39. Fumigant insecticides
A. Kill insects, when they eat it
B. Emit poisonous vapour
C. Are absorbed throughout the plant
D. None of these
Answer : B

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. Chemical formula of BHC, which is an insecticide is
A. C₆H₆Cl₆
B. C₆Cl₆
C. C₆H₅Cl
D. C₆H₄Cl₂
Answer : B

42. Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction
A. Decreases with decrease of thickness of the flakes
B. Increases with the increasing flake size keeping the flake thickness constant
C. Increases considerably with the rise of temperature
D. Decreases as the moisture content of flakes increases
Answer : D

43. Phosphoric acid is prepared from
A. Cryolite
B. Chalcopyrite
C. Rock phosphate
D. None of these
Answer : C

44. Chemical name of Grignard reagent is
A. Sodium thiosulphate
B. Ethyl magnesium chloride
C. Sodium sulphite
D. Sodium bicarbonate
Answer : B

45. 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

46. 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

47. Oils are partially hydrogenated (not fully) to manufacture Vanaspati, because fully saturated solidified oils
A. Cause cholesterol build up and blood clotting
B. Are prone to rancid oxidation
C. Always contain some amount of nickel (as their complete removal is very difficult)
D. Have affinity to retain harmful sulphur compounds
Answer : A

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

49. 99.5% purity oxygen is used in
A. Cutting and welding by oxy-acetylene flame
B. Hospitals for medicinal purposes
C. Gas masks and artificial breathing apparatus
D. All (A), (B), and (C)
Answer : D

50. DDT should not be allowed to come in contact with iron (during its manufacture) to
A. Avoid its decomposition
B. Prevent sulphonation of the monochlorobenzene by the acid catalyst
C. Achieve non-hygroscopic property
D. None of these
Answer : A