RRB NTPC - Chemical Process 1000+ MCQ [Solved] PDF Download

1. Vulcanisation of rubber
A. Decreases its tensile strength
B. Increases its ozone & oxygen reactivity
C. Increases its oil & solvent resistance
D. Converts its plasticity into elasticity
Answer : D

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

3. Digestion of wood-base materials (for manufacture of pulp) is done to
A. Remove lignin
B. Produce long fibres
C. Prevent deterioration on storage
D. None of these
Answer : A

4. Epoxy resin
A. Is a good adhesive
B. Is an elastomer
C. Cannot be used for surface coatings
D. Is a polyester
Answer : A

5. 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

6. __________ is used as a catalyst in fat splitting.
A. ZnO
B. Ni
C. V₂O₅
D. FeO
Answer : A

7. Polymethyl methacrylate (PMMA) is known as
A. Bakelite
B. Teflon
C. Perspex
D. Nylon-6
Answer : C

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

9. An alkali metal salt of Palmitic acid is known as
A. Soap
B. Metallic soap
C. Detergent
D. Alkaloid
Answer : B

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

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

12. Solvay process as compared to dual process
(i.e. modified Solvay process).
A. Can use low grade brine
B. Has less corrosion problems
C. Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl
D. Both (B) and (C)
Answer : D

13. 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

14. Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
A. Slaked lime
B. Soda lime
C. Calcium perchlorate
D. None of these
Answer : A

15. 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

16. BHC (Benzene hexachloride) is made by the chlorination of benzene
A. Which is an addition reaction
B. Which is a substitution reaction
C. In absolute dark
D. In presence of sunlight
Answer : A

17. What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?
A. Cl₂ & Na
B. Cl₂ & H₂
C. O₂ & H₂
D. Cl₂, H₂ & NaOH solution
Answer : D

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

19. Graphite is a/an
A. Electrical insulator
B. Allotrope of carbon
C. Moderator used in nuclear reactor
D. Both (B) and (C)
Answer : D

20. Thermosetting materials
A. Are cross-linked molecules
B. Soften on application of heat
C. Are solvent soluble
D. None of these
Answer : A

21. 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

22. 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

23. 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

24. Salt cake is chemically represented by
A. Na₂SO₄
B. CaSO₄. ½H₂O
C. MgSO₄
D. BaSO₄
Answer : A

25. Pick out the wrong statement pertaining to the soap manufacture.
A. Transparent soaps are made by cold process
B. Organic pigments are used as colouring materials in the soap manufacture
C. Both laundry as well as toilet soaps are manufactured by hot process
D. Colourless rosin is used in the manufacture of laundry soaps
Answer : A

26. 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

27. Poly Tetrafluoroethylene (P.T.F.E.) is known as
A. Bakelite
B. Teflon
C. Celluloid
D. Dacron
Answer : B

28. Concentration of sulphide ores is done usually by
A. Roasting
B. Smelting
C. Froth floatation
D. Electromagnetic separation
Answer : C

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

30. Pick out the exothermic reaction out of the following:
A. C + H₂O = CO + H₂
B. CaC₂ + H₂O = Ca(OH)₂ + C₂H₂
C. MgCO₃ = MgO + CO₂
D. All (A), (B) and (C)
Answer : B

31. Washing soda is chemically represented by
A. Na₂CO₃
B. Na₂CO₃.H₂O
C. Na₂CO₃.10H₂O
D. NaHCO₃
Answer : C

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

33. Which is the most suitable dye for synthetic fibres?
A. Acid dye
B. Azoic dye
C. Pigment dye
D. Mordant dye
Answer : A

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

35. 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

36. 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

37. Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.
A. 10
B. 50
C. 80
D. 95
Answer : B

38. The manufacture of Kraft pulp is done by a/an __________ process.
A. Alkaline
B. Acidic
C. Neutral
D. None of these
Answer : A

39. Pick out the wrong statement.
A. Fibrillation of fibre during paper manufacture is done to develop the strength in paper
B. Alkali consumption in digestion/cooking of bamboo is measured in terms of permanganate number
C. Bagasse fibre contains both lignin & cellulose
D. Presence of sodium sulphate in pulp makes the pulp bleachability poor
Answer : D

40. Sucrose content in the raw juice extracted from sugar cane is about __________ percent.
A. 1 - 2
B. 15 - 20
C. 50 - 60
D. 80 - 85
Answer : B

41. Good quality of edible salt is obtained from brine by the process of
A. Solar evaporation
B. Vacuum evaporation
C. Freeze drying
D. Electrolysis
Answer : B

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

43. Economics of 'Solvay Process' depends upon the efficiency of
A. Carbonating tower
B. Ammonia recovery
C. Ammonia recovery and size of the plant
D. Ammoniation of salt solution
Answer : C

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

45. Hydrazine is largely used
A. As a starting material for 'hypo'
B. In photographic industry
C. As rocket fuel
D. In printing industry
Answer : C

46. Nitrogen is an essential component of
A. Mineral salts
B. Carbohydrates
C. Fats
D. Proteins
Answer : D

47. Fish contains about __________ percent oil.
A. 5
B. 10
C. 20
D. 35
Answer : C

48. Which of the following is not a product of coal tar distillation?
A. Anthracene
B. Creosote oil
C. Carbolic oil
D. None of these
Answer : D

49. Fats as compared to oils have
A. More unsaturated glycerides of fatty acids
B. Less unsaturated glycerides of fatty acids
C. Much higher reactivity to oxygen
D. Lower melting point
Answer : B

50. Direct conversion of chemical energy into electrical energy is done in a
A. Magnetohydrodynamic (MHD) generator
B. Fuel cell
C. Fast breeder reactor
D. None of these
Answer : B