Chemical Process 1000+ MCQ with answer for NDA

1. Styrene-butadiene-rubber (SBR) as compared to natural rubber has
A. Poorer tensile strength
B. Poorer resistance to oxidation
C. Greater amount of heat build-up under heavy loading
D. All (A), (B) and (C)
Answer : D

2. Mannheim furnace is used in the manufacture of
A. Hydrochloric acid
B. H₂SO₄ by Chamber process
C. Calcium carbide
D. Corundum
Answer : A

3. 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

4. The process used for the manufacture of ethyl alcohol from molasses is
A. Distillation
B. Dehydration
C. Dehydrogenation
D. None of these
Answer : D

5. Deaeration of water in its treatment is necessary, as it
A. Minimises its turbidity
B. Helps in controlling its taste and odour
C. Minimises its corrosiveness
D. None of these
Answer : C

6. Soaps remove dirt by
A. Increasing the surface tension
B. Decreasing wettability
C. Supplying hydrophilic group
D. None of these
Answer : D

7. Metallic soap is __________ salt of fatty acids.
A. Sodium
B. Potassium
C. Both sodium & potassium
D. Aluminium or calcium
Answer : D

8. 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

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

10. 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

11. A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.).
A. 1
B. 10
C. 25
D. 40
Answer : B

12. 10% oleum comprises of 10% free
A. SO₂
B. H₂SO₃
C. SO₃
D. H₂SO₄
Answer : C

13. Highly porous refractory bricks are
A. Less susceptible to chemical attack by molten fluxes and gases etc
B. Very strong
C. Having very high thermal conductivity
D. None of these
Answer : D

14. Common salt is generally not produced commonly by __________ method from brine.
A. Freeze drying
B. Electrolytic
C. Solar evaporation
D. Vacuum evaporation
Answer : A

15. Which of the following is the purest form of water out of the following?
A. Underground water
B. Rain water
C. Well water
D. Lake water
Answer : B

16. Carboxymethyl cellulose (CMC) is added in detergents to
A. Prevent redeposition of soil on cleaned surface
B. Act as optical brightening agent
C. Inhibit corrosion in washing machines made of aluminium
D. None of these
Answer : A

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

18. Naphthols are derivates of
A. Methyl amine
B. Naphthalene
C. Phenol
D. Xylene
Answer : B

19. High acid value of an oil or fat is an indication of
A. Storage under improper conditions
B. Absence of unsaturation
C. Its smaller molecular weight
D. None of these
Answer : A

20. Which of the following is an unsaturated fatty acid?
A. Lauric acid
B. Palmitic acid
C. Stearic acid
D. Oleic acid
Answer : D

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

22. Low purity oxygen is used for
A. L.D. steel making
B. Cutting and welding of metals
C. Medicinal purposes
D. Chemical oxidation processes
Answer : D

23. Laboratory glass wares which reacts with hydrofluoric acid, are made of the __________ glass.
A. Lead
B. Borosilicate
C. Soda lime
D. Alkali silicate
Answer : B

24. Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?
A. AgO
B. Al₂O₃
C. ZnCl₂
D. Fe₂O₃
Answer : A

25. Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
A. 70
B. 55
C. 80
D. 94
Answer : D

26. Gypsum is chemically
A. Calcium chloride
B. Potassium sulphate
C. Sodium sulphate
D. Calcium sulphate
Answer : D

27. Potassium is kept & transported under
A. Water
B. Liquid ammonia
C. Kerosene oil
D. Alcohol
Answer : C

28. 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

29. 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

30. Absorption of SO3 in 97% H2SO4 is
A. Exothermic
B. Endothermic
C. Not possible
D. None of these
Answer : A

31. Glycerine is recovered from lye by
A. Evaporation followed by vacuum distillation
B. Liquid extraction technique
C. Extractive distillation technique
D. None of these
Answer : A

32. Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is
A. A slow reaction
B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
C. Still in development stage (by employing fluidised bed technique)
D. All (A), (B) and (C)
Answer : D

33. Rotary kiln is not involved in the production of
A. Cement
B. Lime from limestone
C. Slaked lime from quick lime
D. None of these
Answer : C

34. Penicillin is separated from fermented broth by
A. Extraction with amyl or butyl acetate
B. Ternary Azeotropic distillation
C. Evaporator in calandria
D. Extractive distillation
Answer : A

35. Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
A. 15-30
B. 90-100
C. 250-300
D. < 0
Answer : A

36. 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

37. The process involved in converting rubber into a thin sheet or coating it on fabric is called
A. Extrusion
B. Mastication
C. Calendaring
D. Vulcanisation
Answer : C

38. Lubricating greases are a mixture of
A. Mineral oil, soap and additives
B. Mineral oil and metallic soap
C. Mineral oil and fatty oil
D. Fatty oil and metallic soap
Answer : A

39. Phthalic anhydride is used
A. In making PVC
B. As plasticisers
C. In insecticides manufacture
D. For making nylon-6
Answer : B

40. Fusion of limestone and __________ produces high alumina cement.
A. Sand
B. Bauxite
C. Quicklime
D. Calcite
Answer : B

41. Chemical formula of BHC, which is an insecticide is
A. C₆H₆Cl₆
B. C₆Cl₆
C. C₆H₅Cl
D. C₆H₄Cl₂
Answer : B

42. Silicon carbide is a/an
A. Adhesive
B. Abrasive
C. Type of glass
D. Brittle material
Answer : B

43. Thermal pyrolysis of ethylene dichloride produces
A. Trichloroethylene
B. Vinyl chloride
C. Ethanol amine
D. Ethylene oxide
Answer : B

44. Alcohol percentage in molasses may be around
A. 10
B. 40
C. 70
D. 85
Answer : B

45. At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.
A. Independent of
B. Directly proportional to
C. Inversely proportional to
D. Proportional to the square of
Answer : A

46. Pick out the wrong statement. Iodine value of an oil or fat is
A. The number of grams of iodine taken up by 100 gm of oil or fat
B. A measure of its unsaturation
C. Helpful in findings its adulteration & its suitability for making soap
D. Independent of the type of oil, whether it is drying or non-drying
Answer : D

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

48. 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

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

50. Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process?
A. NH3
B. NaCl
C. CaO
D. Coke
Answer : A