Chemical Process 1000+ MCQ with answer for GRE

1. Basic oxide is absent in __________ glass.
A. Flint
B. Pyrex
C. Quartz
D. All (A), (B) & (C)
Answer : C

2. Which of the following is not required in the manufacture of soda ash by Solvay process?
A. Ammonia
B. Limestone
C. Nitric acid
D. None of these
Answer : C

3. High purity nitrogen is used in
A. Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
B. Fire fighting purposes
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

4. The type of high refractive index glass used in optical instruments is __________ glass.
A. Pyrex
B. Flint
C. Crookes
D. None of these
Answer : B

5. Which of the following fuel gases contains maximum amount of carbon monoxide?
A. Coke oven gas
B. Water gas
C. Blast furnace gas
D. L.D. converter gas
Answer : D

6. Zeolite used in water softening process (cation exchange) is regenerated by washing with
A. Brine
B. Chloramines
C. Sodium bisulphite
D. Liquid chlorines
Answer : A

7. Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.
A. Endothermic
B. Exothermic
C. Irreversible
D. Both (B) and (C)
Answer : D

8. Solvent extracted oil
A. Has low free fatty acid content
B. Is odourless
C. Has more of unsaturates
D. None of these
Answer : D

9. At a given temperature, the equilibrium yield of SO3 obtained from the oxidation of SO2 is proportional to (where, P = pressure of the system).
A. P
B. ?P
C. P²
D. 1/P
Answer : B

10. Viscose rayon is chemically
A. Cellulose nitrate
B. Regenerated cellulose nitrate
C. Cellulose acetate
D. Regenerated cellulose acetate
Answer : D

11. Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.
A. Adsorbs
B. Oxidises
C. Reduces
D. Converts
Answer : A

12. Kaolin is a/an
A. Refractory material
B. Synthetic resin
C. Artificial abrasive
D. Blue pigment
Answer : A

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

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

15. 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

16. 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

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

18. The biochemical treatment applied to sewage effluents is a process of
A. Dehydration
B. Reduction
C. Oxidation
D. Polymerisation
Answer : C

19. Fire clay is __________ refractory material.
A. A basic
B. An acidic
C. A neutral
D. Not a
Answer : B

20. The purpose of adding Na₂CO₃ to water of low alkalinity is to
A. Permit the use of alum as a coagulant
B. Increase the softening capacity of zeolite
C. Facilitate easy regeneration of zeolite
D. All (A), (B) and (C)
Answer : A

21. Pick out the wrong statement.
A. Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate
B. Glass is decolorized during its manufacture by adding antimony oxide, manganese dioxide or arsenic oxide
C. Ordinary glass is represented chemically by Na₂O . CaO . 6SiO₂
D. Red color is imparted to glass by addition of arsenic oxide
Answer : D

22. Drinking (potable) water treatment does not involve
A. Coagulation
B. Sedimentation
C. Softening
D. Disinfection
Answer : C

23. Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
A. 25
B. 60-70
C. 150-200
D. 250-300
Answer : B

24. __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
A. Pyrex
B. Soda lime
C. Lead
D. High silica
Answer : A

25. Which of the following contains least amount of N₂?
A. Coke oven gas
B. Blast furnace gas
C. Producer gas
D. Water gas (blue gas)
Answer : A

26. Yellow glycerine is made into white, using
A. Activated carbon
B. Diatomaceous earth
C. Bauxite
D. Bentonite
Answer : A

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

28. 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

29. 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

30. The most reactive allotropic form of phosphorus is __________ phosphorus.
A. Red
B. Yellow
C. Violet
D. Black
Answer : B

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

32. Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction
A. Decreases with decrease of thickness of the flakes
B. Increases with the increasing flake size keeping the flake thickness constant
C. Increases considerably with the rise of temperature
D. Decreases as the moisture content of flakes increases
Answer : D

33. Which of the following is the second major component of cement?
A. Al₂O₃
B. CaO
C. SiO₂
D. Fe₂O₃
Answer : B

34. 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

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

36. Ethanol amine is produced using ammonia and
A. Ethyl benzene
B. Ethylene oxide
C. Ethanol
D. Ethane
Answer : B

37. Dichloro diphenyl __________ is the full form of DDT (an insecticide).
A. Tetrachloroethane
B. Trichloroethane
C. Tetrachloromethane
D. Trichloromethane
Answer : B

38. Pick out the wrong statement.
A. Conversion of SO₂ to SO₃ in Monsanto-4 pass converter is about 98%
B. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide
C. Vitriol oil is nothing but technical sulphuric acid
D. Decomposition of sulphuric acid on heating does not start before its boiling
Answer : D

39. 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

40. Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
A. 80
B. 90
C. 98
D. 100
Answer : C

41. Fluorescent dyes are added in detergents to
A. Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics
B. Attain distinctiveness from other brands
C. Act as tarnish inhibitor for metals like German silver
D. None of these
Answer : A

42. Saponification number of an oil or fat
A. Gives an idea about its molecular weight
B. Is inversely proportional to its molecular weight
C. Detects its adulteration
D. All (A), (B) & (C)
Answer : D

43. Hydrogenation of oil/fat does not
A. Improve its resistance to rancid oxidation
B. Raise its melting point
C. Remove double bonds
D. None of these
Answer : D

44. Salt is the basic raw material for the manufacture of
A. Cement
B. Glass
C. Potteries
D. Caustic soda
Answer : D

45. Gun powder, which is an explosive comprises of charcoal, sulphur and
A. Glycerine
B. Salt petre
C. Nitro glycerine
D. Dynamite
Answer : B

46. 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

47. The product obtained on mixing calcium oxide with water is called
A. Quicklime
B. Slaked lime
C. Milk of lime
D. None of these
Answer : B

48. 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

49. Antibiotic
A. Inhibits/destroys the growth of microorganisms
B. Is used as a pain reliever
C. Is an antimalarial
D. Is an anaesthetic
Answer : A

50. Helium is produced on commercial scale from
A. Air
B. Natural gas
C. Coke oven gas
D. None of these
Answer : B