1000+ Chemical Process MCQ for SSC Scientific Assistant [Solved]

1. 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

2. Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.
A. Mechanical
B. Sulphate/Kraft
C. Sulphite
D. Neutral sulphite semi-chemical
Answer : D

3. Gun powder uses
A. Sulphur
B. Charcoal
C. Potassium nitrate
D. All (A), (B), & (C)
Answer : D

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

5. Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?
A. Xanthates
B. Stearic acid
C. Calcium & aluminium stearate
D. Formic acid
Answer : C

6. Le-Blanc process is a primitive process for the manufacture of
A. Caustic soda
B. Soda ash
C. Bromine from sea water
D. Hydrochloric acid
Answer : B

7. __________ process is used for the manufacture of sodium carbonate by ammonia soda process.
A. Ostwald's
B. Bosch
C. Solvay
D. Haber's
Answer : C

8. Varnish does not contain
A. Pigment
B. Thinner
C. Dryer
D. Anti-skimming agent
Answer : A

9. Which of the following is a constituent of coffee?
A. Caffeine
B. Nicotine
C. Calgon
D. Lignin
Answer : A

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

11. Main product in calcium carbide-water reaction is
A. Ca(OH)₂
B. C₂H₂
C. CO₂
D. CaCO₃
Answer : B

12. 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

13. A substance produced by a living organism and capable of anti-microbial activity is called a/an
A. Antibiotic
B. Antiseptic
C. Disinfectant
D. None of these
Answer : A

14. The end bleaching agent used to move last traces of colour bodies from the pulp is
A. Chlorine dioxide (ClO₂)
B. MgO
C. SO₂ gas
D. Mercaptans
Answer : A

15. Nylon-66 is so named because the
A. Average degree of polymerisation of the polymer is 1966
B. Number of carbon atoms between two nitrogen atoms are 6
C. Number of nitrogen atoms between two carbon atoms are 6
D. Polymer was first synthesised in 1966
Answer : A

16. In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst
A. Gives higher conversion efficiency
B. Has a longer life and is not poisoned by arsenic
C. Handles lower SO2 content gas (7 -10% SO₂), thus increasing the capital cost of the plant
D. All (A), (B) and (C)
Answer : D

17. Dense soda ash used in the manufacture of glass, is chemically represented by
A. Na₂CO₃
B. Na₂CO₃.10H₂O
C. Na₂CO₃.H₂O
D. Na₂HCO₃
Answer : C

18. P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as
A. Bakelite
B. Neoprene
C. Teflon
D. Nylon-66
Answer : C

19. Contact process of sulphuric acid manufacture
A. Yields acid of higher concentration than chamber process
B. Yields acids of lower concentration than chamber process
C. Is obsolete
D. Eliminates absorber
Answer : A

20. Catalytic oxidation of naphthalene produces
A. Styrene
B. Phenol
C. Phthalic anhydride
D. None of these
Answer : C

21. Conversion of CO to CO2 by steam in presence of a catalyst is called
A. Steam reforming
B. Shift conversion
C. Steam gasification
D. None of these
Answer : B

22. Saponification value/number of an oil or fat is a measure of its
A. Fatty acid content
B. Degree of unsaturation of the fatty acids present in it
C. Average molecular weight
D. Insoluble fatty acid content
Answer : C

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

24. Sucrose is a disaccharide consisting of
A. Glucose and glucose
B. Glucose and fructose
C. Glucose and galactose
D. Fructose and galactose
Answer : B

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

26. The chamber process is
A. Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
B. Non-catalytic and operates only on pyrites
C. A batch process for directly producing high strength (98 to 100%) H₂SO₄
D. None of these
Answer : D

27. Parathion and Malathion are
A. Pesticides
B. Plasticisers for unsaturated polyesters
C. Pain-relieving drugs (analgesic)
D. Tranquilisers
Answer : A

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

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

30. Most commonly used rubber vulcanising agent is
A. Sulphur
B. Bromine
C. Platinum
D. Alumina
Answer : A

31. Styrene butadiene rubber (SBR) is
A. A natural rubber
B. A synthetic polymer
C. A synthetic monomer
D. Another name of silicone rubber
Answer : B

32. __________ are added in lacquers to remove film brittleness and to improve adhereness.
A. Film forming materials
B. Plasticisers
C. Diluents
D. Solvents
Answer : B

33. Kopper-Totzek coal gasifier
A. Can give ammonia synthesis gas (H2 + N2)
B. Is a moving bed reactor
C. Cannot use coking coal
D. Operate at very high pressure
Answer : A

34. Trinitro-toluene (TNT) is
A. Used in glycerine manufacture
B. An explosive
C. Used in dye manufacture
D. None of these
Answer : B

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

36. Celluloid is chemically
A. Cellulose acetate
B. Regenerated cellulose
C. Cellulose nitrate
D. Cellulose acetate butyrate
Answer : C

37. Coagulant is used __________ filtration.
A. Before
B. After
C. During
D. To avoid
Answer : A

38. Permanent hardness of water can be removed by
A. Simply boiling
B. Adding alum
C. Passing it through cation & anion exchangers
D. All (A), (B) and (C)
Answer : C

39. Main constituent of limestone is
A. CaCO₃
B. MgCO₃
C. Na₂CO₃
D. CaSO₄
Answer : A

40. __________ is an ore of lead.
A. Quartz
B. Galena
C. Siderite
D. Chalcopyrite
Answer : B

41. Rancidity of the fatty oil can be reduced by its
A. Decoloration
B. Hydrogenation
C. Oxidation
D. Purification
Answer : B

42. Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of
A. Collagen
B. Tannin
C. Molasses
D. Carbohydrate
Answer : A

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

44. The most commonly used substance to speed up the sedimentation of sewage is
A. Lime
B. Sulphuric acid
C. Chlorine
D. Sodium bisulphite
Answer : A

45. Flux addition during smelting of ore is done to
A. Remove impurities/gangue
B. Enhance rate of reaction
C. Accelerate reduction of ore
D. Separate slag from metal
Answer : A

46. Enzymes are
A. Proteins with high molecular weight (around 10,000)
B. Derived from living organisms
C. Catalyst for temperature sensitive reactions
D. All (A), (B) and (C)
Answer : D

47. Claude process of gas liquefaction employs
A. Merely compression of gas beyond its critical pressure
B. Joule-Thomson expansion cooling
C. Heat exchange with colder stream
D. Adiabatic expansion against a piston or in a turbine
Answer : D

48. Which of the following is a constituent of vinegar?
A. Around 10% alcohol
B. Around 1% acetic acid
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C

49. Sugar content in sugarcane on cane basis is about __________ percent by weight.
A. 1 to 5
B. 5 to 10
C. 15 to 20
D. 20 to 30
Answer : B

50. Which of the following sugars is the sweetest?
A. Glucose
B. Fructose
C. Sucrose
D. Lactose
Answer : B