1000+ Chemical Process MCQ for SSC Stenographer [Solved]

1. Pick out the wrong statement.
A. Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%
B. Contact process of sulphuric acid manufacture produces pure acid of concentration ? 98%
C. 75% oleum can be produced by distillation of 20% oleum
D. Contact process of sulphuric acid manufacture uses nickel as the catalyst
Answer : D

2. Free alkali in a toilet soap is __________ that in a laundry shop.
A. Less than
B. More than
C. Same
D. None of these
Answer : A

3. Solvay process is used for the manufacture of
A. Caustic soda
B. Soda ash
C. Caustic potash
D. Soda lime
Answer : B

4. 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

5. 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

6. Basic oxide is absent in __________ glass.
A. Flint
B. Pyrex
C. Quartz
D. All (A), (B) & (C)
Answer : C

7. Which of the following is the second major component of cement?
A. Al₂O₃
B. CaO
C. SiO₂
D. Fe₂O₃
Answer : B

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

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

10. __________ are used as corrosion inhibitor for iron & steel in aqueous solutions.
A. Phosphates
B. Chromates
C. Sulphates
D. Bi-carbonates
Answer : B

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

12. Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
A. Poor oxidation stability and high gum forming tendency
B. Greater tendency of decomposition at elevated temperature
C. Hydrolysis tendency in presence of water
D. All (A), (B) and (C)
Answer : D

13. Cooking liquor in case of sulphite process is
A. Sodium sulphite and sodium bisulphite
B. Magnesium sulphite and free SO2 in acid medium
C. Magnesium sulphate and magnesium bicarbonate
D. None of these
Answer : A

14. White phosphorous is stored under water, because
A. It does not react with water
B. It is poisonous
C. Its kindling temperature in dry air is very low
D. It is unstable
Answer : C

15. Sea weeds are an important source of
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Answer : D

16. Essential oils are usually obtained using
A. Steam distillation
B. Extractive distillation
C. Solvent extraction
D. Leaching
Answer : D

17. Adipic acid is an intermediate in the manufacture of
A. Perspex
B. Nylon-66
C. Polystyrene
D. Bakelite
Answer : B

18. The basic difference between vegetable oils and fats is in their
A. Density
B. Chemical properties
C. Physical state
D. Composition
Answer : C

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

20. Bakelite is chemically known as
A. Polyvinyl chloride (PVC)
B. Polybutadiene
C. Phenol formaldehyde
D. Polyurethane
Answer : C

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

22. Acrylonitrile is mainly used in the __________ industry.
A. Polymer
B. Printing
C. Dyeing
D. Photographic
Answer : C

23. 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

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

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

26. 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

27. Ca(OH)₂ is called
A. Quicklime
B. Slaked lime
C. Limestone
D. Gypsum
Answer : B

28. Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because
A. Its calorific value is very less
B. Tar neutralises the residual acids present in pitch
C. It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
D. All (A), (B) and (C)
Answer : C

29. Sulphuric acid completely saturated with sulphur trioxide is called
A. Concentrated sulphuric acid
B. Oleum
C. Sulphurous acid
D. Dilute sulphuric acid
Answer : A

30. 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

31. Nylon-6 is manufactured from
A. Caprolactam
B. Hexamethylene diamine and adipic acid
C. Hexamethylene diamine and Maleic anhydride
D. Hexamethylene diamine and Sebacic acid
Answer : A

32. The catalyst used in shift converter is
A. Nickel
B. Vanadium
C. Silica gel
D. Alumina
Answer : A

33. Vanillin is a type of
A. Anti-pyretic drug
B. Food preservative
C. Flavour
D. Dye
Answer : C

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

35. Chemical name of 'alum' is
A. Barium sulphate
B. Aluminium sulphate
C. Aluminium chloride
D. Calcium sulphate
Answer : B

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

37. Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to
A. Reduce its viscosity
B. Increase its viscosity
C. Reduce the variation in its viscosity with temperature
D. Increase the variation in its viscosity with temperature
Answer : C

38. Coke oven gas consists mainly of
A. H₂, & CH₄
B. CO, & CO₂
C. H₂, & CO
D. CH₄, & CO
Answer : A

39. Frasch process is for
A. Making oxygen
B. Producing helium
C. Mining sulphur
D. Making nitrogen
Answer : C

40. Enzymes are organic catalysts used in the __________ reactions.
A. Chemical
B. Biochemical
C. Photochemical
D. Electrochemical
Answer : B

41. 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

42. Dehydrogenation of Isopropanol produces
A. Propyl alcohol
B. Acetone
C. Trichloroethylene
D. Formaldehyde
Answer : B

43. Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.
A. Phthalic anhydride
B. Vinyl chloride
C. Maleic anhydride
D. Dacron
Answer : B

44. Which of the following is an yellow pigment?
A. Titanium dioxide
B. Ferrous sulphate
C. Lead chromates
D. Zinc sulphides
Answer : C

45. Pick out the wrong statement.
A. Strongly caking coal should not be used in the Lurgi gasifier
B. Acetylene gas cannot be used for illumination purpose
C. Water gas is called blue gas because of the color of the flame, when it is burnt
D. Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels
Answer : B

46. Ultimate analysis of coal determines its __________ content.
A. Carbon, hydrogen, nitrogen & sulphur
B. Carbon, ash, sulphur & nitrogen
C. Carbon, sulphur, volatile matter & ash
D. Carbon, volatile matter, ash & moisture
Answer : C

47. Thermosetting plastic materials
A. Can be repeatedly melted
B. Is useful for melt casting
C. Cannot be melted after forming
D. Is useful for spinning
Answer : C

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

49. Which of the following is the main constituent of the mother liquor produced in salt industry?
A. Quick lime
B. Glauber's salt
C. Salt petre
D. Bromine
Answer : D

50. Starting raw material for the manufacture of alum is
A. Alumina
B. Gypsum
C. Bauxite
D. Ammonium bicarbonate
Answer : C