Chemical Process 1000+ MCQ with answer for SSC CHSL

1. Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
A. Pyrolysis of oil
B. Sintering of porous catalyst
C. Hydrogen embrittlement
D. All (A), (B) and (C)
Answer : D

2. Extraction of __________ employs an electrolytic process.
A. Aluminium
B. Silver
C. Copper
D. All (A), (B) and (C)
Answer : A

3. Mercury cells for caustic soda manufacture, compared to diaphragm cells
A. Require lower initial investment
B. Require more power
C. Produce lower concentration NaOH
D. None of these
Answer : D

4. Phenolic antiseptics are added in the __________ soap.
A. Shaving
B. Medicated
C. Metallic
D. Transparent
Answer : B

5. Soap cannot be used with hard water, because
A. Hard water contains sulphate
B. They form insoluble calcium soaps which precipitate
C. They attract back the removed dirt
D. None of these
Answer : B

6. Industrial production of chloroform requires acetone and
A. Phosgene
B. Calcium hypochlorite
C. Chlorine
D. Ammonium chloride
Answer : B

7. Use of hydrated lime in water treatment
A. Before filtration, reduces the bacterial load on filters
B. After filtration, combats the corrosiveness of water due to the presence of O₂ & CO₂
C. Is to adjust the pH value
D. All (A), (B) and (C)
Answer : D

8. 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

9. __________ is the major constituent of the Portland cement.
A. Calcium carbonate
B. Calcium oxide
C. Tricalcium silicate
D. Calcium sulphate
Answer : C

10. Sulphur removal by heating of pyrite ore in presence of air is called its
A. Reduction
B. Roasting
C. Calcination
D. Smelting
Answer : B

11. 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

12. 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

13. Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.
A. -83
B. -183
C. -196
D. -218
Answer : B

14. __________ is produced using Polycondensation reaction.
A. Polythene
B. Phenol formaldehyde
C. Poly vinyl chloride
D. None of these
Answer : B

15. 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

16. 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

17. Chemical name of aspirin (an analgesic drug) is
A. Acetylsalicylic acid
B. Nictonic acid
C. Calcium acetate
D. Methyl salicylate
Answer : A

18. In contact process, SO₃ is absorbed in 97% H₂SO₄ and not in water, because
A. SO₃ gas is sparingly soluble in water
B. Water forms an acid mist, which is difficult to absorb
C. The purity of acid is affected
D. Scale formation in the absorber is to be avoided
Answer : B

19. Concentration of hydrogen peroxide is done by
A. Crystallisation
B. Vacuum crystallisation
C. Atmospheric distillation
D. Dehydration
Answer : B

20. 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

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

22. 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

23. 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

24. Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.
A. Hard
B. Soft
C. Metallic
D. Lubricating
Answer : B

25. Nitric acid is not used in the manufacture of
A. Detergents
B. Fertilisers
C. Aqua regia
D. Explosives
Answer : A

26. H2S is scrubbed from refinery gases by absorption using
A. Dilute H₂SO₄
B. Ethanol amine
C. Chilled water
D. Tri-butyl phosphate
Answer : B

27. Pick out the wrong statement.
A. Catalytic hydrogenation of carbon monoxide produces methyl alcohol
B. In nylon-6, the number 6 represents the total number of carbon atoms in the ring
C. Raw materials for DDT manufacture are benzene and chlorine
D. Ethanolamines are produced by using ammonia and ethylene oxide as raw material
Answer : C

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

29. Oleum produces fumes of
A. SO₂
B. H₂SO₄
C. SO₃
D. SO₂ + H₂SO₄
Answer : C

30. Fat dispersed in water is exemplified by
A. Colloids
B. Gel
C. Butter
D. Emulsion
Answer : C

31. Argon is the third largest constituent of air (followed by N₂ & O₂). Its percentage by volume in air is
A. 0.14
B. 0.34
C. 0.94
D. 1.4
Answer : C

32. Diaphragm electrolytic cell as compared to mercury electrolytic cell
A. Produces 70% NaOH solution
B. Requires less specific power consumption for the production of chlorine
C. Requires lesser investment for similar capacity
D. All (A), (B) and (C)
Answer : C

33. Oil produced by solvent extraction
A. Has low free fatty acid content
B. Is odourless
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : D

34. Hydrogen gas is not produced commercially (for nitrogenous fertiliser manufacture) by
A. Iron-steam reaction
B. Electrolysis of water
C. Steam reforming of naphtha
D. Its cryogenic separation from coke oven gas
Answer : A

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

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

37. Pick out the wrong statement.
A. Cold rubber (SBR) is superior as compared to hot rubber (SBR)
B. Polymerisation temperature can modify the properties of SBR
C. Production of cold SBR employs lower pressure as compared to that of hot SBR
D. None of these
Answer : D

38. Producer gas consists mainly of
A. CO, CO₂ N₂, H₂
B. CO, H₂
C. H₂, CH₄
D. C₂H₂, CO₂, H₂
Answer : A

39. Neoprene is chemically known as
A. Polybutadiene
B. Styrene butadiene rubber (SBR)
C. Polyurethane
D. Polychlorophrene
Answer : D

40. __________ is a polysaccharide.
A. Maltose
B. Starch
C. Sucrose
D. Glucose
Answer : B

41. 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

42. Isopropyl benzene produced by alkylation of benzene with propylene is known as
A. Neoprene
B. Cumene
C. Gelatin
D. Mercaptans
Answer : B

43. 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

44. 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

45. In Kraft process of paper manufacture, white cooking liquor consists of caustic soda
A. Sodium sulphide & sodium carbonate
B. Sodium sulphite & sodium carbonate
C. Sodium sulphite & sodium sulphide
D. None of these
Answer : A

46. Presence of sodium tripolyphosphate (an additive) in synthetic detergent
A. Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
B. Inhibits its corrosive effects
C. Does not allow redeposition of dirt on the cleaned surface
D. None of these
Answer : A

47. Thermoplastic materials
A. Do not soften on application of heat
B. Are heavily branched molecules
C. Are solvent insoluble
D. None of these
Answer : D

48. The catalyst used in the manufacture of DDT is
A. Alumina
B. Silica
C. 20% oleum
D. Aluminium chloride
Answer : C

49. Massecuite is a terminology used in the __________ industry.
A. Paint
B. Oil hydrogenation
C. Soap
D. Sugar
Answer : D

50. __________ iron is the purest form of iron.
A. Cast
B. Wrought
C. Pig
D. High silicon
Answer : B