GATE - Chemical Process 1000+ MCQ [Solved] PDF Download

1. 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

2. Wet chlorine gas produced during electrolysis of brine is dehydrated by
A. Spraying 66° Be H2SO4 counter current to the flow of the gas
B. Passing it through a bed of diatomaceous earth
C. Passing it through a bed of silica gel
D. None of these
Answer : A

3. In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ? 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by
A. Increasing the oxygen concentration
B. Putting more quantity of V2O5 catalyst in the converter
C. Removing some quantity of SO3 during intermediate stage
D. Maintaining low temperature & pressure in the converter
Answer : C

4. Heating of __________ to 120°C, produces plaster of paris.
A. Blue vitriol
B. Gypsum
C. Calcium silicate
D. Calcium sulphate
Answer : B

5. Solvay process is used for the manufacture of
A. Caustic soda
B. Soda ash
C. Caustic potash
D. Soda lime
Answer : B

6. The most stable allotropic form of phosphorous is the __________ phosphorous.
A. White
B. Black
C. Yellow
D. Red
Answer : B

7. Haemoglobin is a/an
A. Amino acid
B. Biological catalyst
C. Protein
D. Enzyme
Answer : C

8. Electro deposition of metals i.e. electroplating is never done on
A. Metals
B. Alloys
C. Refractories
D. Non-metals
Answer : C

9. Permanent hardness of water can be removed by
A. Simply boiling
B. Adding alum
C. Passing it through cation & anion exchangers
D. All (A), (B) and (C)
Answer : C

10. 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

11. 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

12. Liquor poisoning generally occurs due to the presence of __________ in it.
A. Ethyl alcohol
B. Impurities
C. Methyl alcohol
D. Carbonic acid
Answer : C

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

14. Varnish does not contain
A. Thinner
B. Pigment
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

15. Neoprene is the trade name of
A. Polyurethane
B. Phenol formaldehyde
C. Polychlorophrene
D. Styrene-butadiene rubber
Answer : C

16. A unit operation is exemplified by the process of
A. Reduction
B. Desorption
C. Nitration
D. Combustion
Answer : B

17. Widely used method for the conditioning of boiler feed water is the
A. Cold lime process
B. Coagulation
C. Hot-lime soda process
D. Sequestration
Answer : C

18. Bitterns is a/an
A. Unsaturated fat
B. Starting material for the production of iodine
C. By-product of chlor-alkali industry
D. None of these
Answer : D

19. Percentage of alcohol in beer may be around __________ percent.
A. 2-8
B. 18-23
C. 27-32
D. 1-4
Answer : A

20. Polycaprolactam is commercially known as
A. Nylon-6
B. Nylon-66
C. Dacron
D. Rayon
Answer : A

21. In the Lurgi coal gasifier
A. Coking coals cannot be used
B. Low carbon conversion efficiency is achieved
C. Entrainment of solids is higher
D. Large quantity of coal can be processed
Answer : D

22. __________ 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

23. Neoprene is a
A. Monomer
B. Synthetic rubber
C. Polyester
D. None of these
Answer : B

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

25. Which of the following is an organometallic compound?
A. Isopropyl alcohol
B. Tetra-ethyl lead
C. Zeolite
D. Cumene
Answer : B

26. Thorium is mainly used
A. For the manufacture of gas mantles
B. As a fissile fuel in a nuclear reactor
C. In the manufacture of hydrogen bomb
D. In the treatment of cancer
Answer : A

27. 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

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

29. Anion exchanger is regenerated usually with
A. NaOH
B. H2SO4
C. Hydrazine
D. Alum solution
Answer : A

30. Pick out the wrong statement.
A. Dry process is used for the manufacture of cement, when the raw material is blast furnace slag
B. Portland cement is made employing wet process
C. Gypsum is added to Portland cement to lengthen its setting time
D. None of these
Answer : D

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

32. In the production of soda ash by Solvay process, the by-product is
A. CaCl₂
B. NH₄Cl
C. NH₃
D. NaOH
Answer : A

33. Reaction of calcium carbide with water produces a gas, which is used
A. As an illuminant
B. For metal cutting/welding
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

34. Which of the following is not an antibiotic?
A. Penicillin
B. Streptomycin
C. Tetracycline
D. Quinine
Answer : D

35. Proximate analysis of coal determines its __________ content.
A. Moisture, ash, sulphur & volatile matter
B. Moisture & volatile matter
C. Moisture, sulphur, nitrogen & fixed carbon
D. None of these
Answer : B

36. Coke used for the production of calcium carbide should have
A. Low ash content
B. Low ignition temperature
C. High electrical resistivity
D. All (A), (B) and (C)
Answer : D

37. Which of the following is a disaccharide?
A. Sucrose
B. Glucose
C. Starch
D. Maltose
Answer : A

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

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. During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
A. Increase the rate of absorption
B. Avoid corrosion
C. Reduce the cooling water circulation rate
D. None of these
Answer : B

41. __________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
A. Chlorine
B. Ammonium chloride
C. Sodium carbonate
D. Sodium bi-carbonate
Answer : A

42. 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

43. Pure rectified spirit contains about __________ percent alcohol.
A. 45
B. 70
C. 95
D. 99.5
Answer : C

44. Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.
A. Phthalic anhydride
B. Vinyl chloride
C. Maleic anhydride
D. Dacron
Answer : B

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

46. Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulfonic acid produces sodium dodecylbenzene sulphate, which is a/an
A. Explosive
B. Soap
C. Detergent
D. Analgesic drug
Answer : C

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

48. Rancidity of the fatty oil can be reduced by its
A. Decoloration
B. Hydrogenation
C. Oxidation
D. Purification
Answer : B

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

50. Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?
A. Slag cement
B. Glasses
C. Porcelain/Potteries
D. Teflon
Answer : D