Chemical Process 1000+ MCQ with answer for RRB Group D

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

2. Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?
A. Na₂CO₃
B. NaHCO₃
C. H₂
D. None of these
Answer : C

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

4. 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

5. 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

6. A bio-catalyst produced by living cells which acts independent of the cell is called a/an
A. Substrate
B. Enzyme
C. Nutrient
D. None of these
Answer : B

7. Main constituent of dolomite is
A. CaCO₃
B. MgCO₃
C. K₂CO₃
D. Na₂CO₃
Answer : B

8. 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

9. Carboxymethyl cellulose (CMC) is added in detergents to act as a/an
A. Surfactant
B. Builder
C. Optical brightening agent
D. Anti soil redeposition agent
Answer : D

10. 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.
A. < 0
B. 10-30
C. 250-280
D. 500-600
Answer : B

11. Which of the following is a detergent?
A. Fatty alcohol
B. Alkyl benzene sulphonate (ABS)
C. Fatty acids
D. Methylene chloride
Answer : B

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

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

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

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

16. Bordeaux mixture is a/an
A. Fertiliser
B. Inorganic fungicide
C. Insecticide
D. Explosive
Answer : B

17. 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

18. Presence of H₂S in raw water (to be chlorinated) results in the
A. Reduced softening capacity of zeolite
B. Increased dosage of chlorine to provide a disinfecting residual in the water
C. Easy removal of its hardness
D. None of these
Answer : B

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

20. Brackish water which contains mostly dissolved salt, can be purified by the __________ process.
A. Reverse osmosis
B. Sand filter
C. Lime soda
D. Permutit
Answer : A

21. Catalyst used during the manufacture of 'Vanaspati Ghee' is
A. Zinc
B. Nickel
C. Platinum
D. Copper
Answer : B

22. Plaster of Paris is
A. CaSO₄. ½H₂O
B. Used for setting of broken bones
C. Both (A) and (B)
D. Same as gypsum
Answer : C

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

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

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

26. 10% oleum comprises of 10% free
A. SO₂
B. H₂SO₃
C. SO₃
D. H₂SO₄
Answer : C

27. __________ acid is an unsaturated fatty acid.
A. Palmitic
B. Oleic
C. Stearic
D. Oxalic
Answer : B

28. Which is the most efficient absorbent for SO₃ out of the following?
A. 20% oleum
B. 65% oleum
C. 78% H₂SO₄
D. 98% H₂SO₄
Answer : D

29. 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

30. Polyvinyl chloride (PVC) is
A. A thermosetting material
B. A condensation polymerisation product
C. Made by employing emulsion polymerisation
D. None of these
Answer : C

31. Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
A. Emulsification
B. Dispersion
C. Precipitation
D. Wetting
Answer : C

32. Phthalic anhydride is made by the
A. Oxidation of naphthalene
B. Oxidation of benzene
C. Dehydrogenation of ethyl benzene
D. None of these
Answer : A

33. Titanium dioxide is a/an __________ colour pigment.
A. White
B. Black
C. Yellow
D. Blue
Answer : A

34. __________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace.
A. Bauxite
B. Limestone
C. Quartz
D. Manganese
Answer : B

35. Which one of the following is not an elastomer?
A. Polyisoprene
B. Neoprene
C. Nitrile-butadiene
D. None of these
Answer : D

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

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

38. Pick out the wrong statement.
A. Azoic dyes are mostly applied on cotton fabrics
B. Basic dyes (e.g. amino derivatives) are applied mostly to paper
C. Mordant dyes are applied mainly to wools
D. None of these
Answer : D

39. Hydrogenation of oil takes place in a/an __________ reactor.
A. Autothermal
B. Trickle bed
C. Plug flow
D. None of these
Answer : B

40. Sodium bisulphite is used for __________ water.
A. Deaeration
B. Dechlorination
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

41. Chloral is used in the manufacture of
A. DDT
B. BHC
C. Parathion
D. None of these
Answer : A

42. Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
A. Coke and sand
B. Brine and coal
C. Coke and caustic soda
D. None of these
Answer : B

43. Which oil is preferred for paint manufacture?
A. Drying oil
B. Non-drying oil
C. Semi-drying oil
D. Saturated oil
Answer : A

44. Alum [Al₂(SO₄)₃] is used as a coagulant in water treatment to remove
A. Colour
B. Turbidity
C. Bacteria
D. All (A), (B) and (C)
Answer : D

45. Zeigler process
A. Produces high density polyethylene
B. Produces low density polyethylene
C. Uses no catalyst
D. Employs very high pressure
Answer : A

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

47. SO2 is bubbled through hot sugar cane juice to
A. Act as an acidifying agent
B. Increase its concentration
C. Increase the amount of molasses
D. Increase the crystal size
Answer : A

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

49. Electric bulbs are made of __________ glass.
A. Jena
B. Flint
C. Crookes
D. Pyrex
Answer : B

50. The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at
A. SASOL (in South Africa)
B. Redcar (U.K.)
C. Los Angeles (U.S.A.)
D. Trombay (India)
Answer : A