1000+ Chemical Process Multiple Choice Question Answer [Solved]

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

2. A mineral is termed as 'ore', if
A. A metal can be economically extracted from it
B. It contains ? 40% metal
C. The metal present in it is costly
D. All (A), (B) and (C)
Answer : A

3. Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?
A. Xanthates
B. Stearic acid
C. Calcium & aluminium stearate
D. Formic acid
Answer : C

4. Which of the following is not a raw material used for the manufacture of ordinary glass?
A. Iron oxide
B. Soda ash
C. Limestone
D. Silica
Answer : A

5. Separation of fresh water from sea water can be done by the __________ operation.
A. Osmosis
B. Reverse osmosis
C. Absorption
D. Adsorption
Answer : B

6. 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

7. Iron ore hematite is concentrated using
A. Electromagnetic separation mainly
B. Gravity separation
C. Froth floatation
D. Roasting
Answer : B

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

9. Sugar content in sugarcane on cane basis is about __________ percent by weight.
A. 1 to 5
B. 5 to 10
C. 15 to 20
D. 20 to 30
Answer : B

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

11. More than 100 percent of __________ is present in oleum.
A. SO₃
B. H₂SO₄
C. H₂SO₃
D. SO₂
Answer : B

12. Blue colour is imparted to glass by the addition of
A. FeSO₄
B. PbO
C. CaO
D. NaOH
Answer : C

13. 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

14. 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

15. Chalcopyrite is the main ore of
A. Copper
B. Lead
C. Tin
D. Iron
Answer : A

16. Permanent hardness of water can be removed by
A. Addition of soda ash to it
B. Treating it with zeolites
C. Passing it through sodium hexametaphosphate
D. All (A), (B), and (C)
Answer : D

17. 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

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

19. __________ iron is the purest form of iron.
A. Cast
B. Wrought
C. Pig
D. High silicon
Answer : B

20. Comparing sulphate process with sulphite process, we find that __________ in the later.
A. Both temperature & pressure in the former is less than that
B. Both temperature & pressure in the former is more than that
C. Temperature is more in the former whereas pressure is more
D. Pressure is more in the former whereas temperature is less
Answer : B

21. 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

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

23. 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

24. Glycerine is not used in the
A. Manufacture of explosive
B. Conditioning and humidification of tobacco
C. Manufacture of pharmaceuticals
D. None of these
Answer : D

25. Molasses is the starting material for the production of
A. Alcohol
B. Essential oil
C. Fatty acids
D. Massecuite
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. The noble gas which occurs most abundantly in the atmosphere is
A. Helium
B. Neon
C. Krypton
D. Argon
Answer : D

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

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

30. Which of the following is not an insecticide?
A. Hydrocyanic acid
B. Nicotine
C. Sodium fluoride
D. Hexane
Answer : D

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

32. 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

33. 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

34. Starting material for the production of styrene butadiene rubber (SBR) is
A. Ethyl alcohol
B. Ethylene
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

35. Producer gas consists mainly of
A. CO, CO₂ N₂, H₂
B. CO, H₂
C. H₂, CH₄
D. C₂H₂, CO₂, H₂
Answer : A

36. 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

37. Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
A. Nickel
B. Vanadium
C. Alumina
D. Iron
Answer : B

38. Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at
A. 1 atm & 100°C
B. 5 atm & 275°C
C. 100 atm & 500°C
D. 50 atm & 1000°C
Answer : B

39. __________ Nature of hypo (sodium thiosulphate) makes it useful in photography.
A. Oxidising
B. Reducing
C. Complex forming
D. Photochemical
Answer : C

40. The compressive strength of cement should not be less than about 110Kg/cm² after three days & not less than 170Kg/cm² after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm²/gm.
A. 800
B. 1600
C. 4000
D. 8500
Answer : B

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

42. Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
A. Chromium
B. Arsenic
C. Copper
D. Manganese
Answer : C

43. Margarine is a/an
A. Fat
B. Explosive
C. Plasticiser
D. Rocket propellant
Answer : A

44. __________ of rubber decreases after its vulcanisation.
A. Resistance to the action of organic solvent
B. Tackiness
C. Maximum service temperature
D. Tensile strength
Answer : B

45. Sulphur removal by heating of pyrite ore in presence of air is called its
A. Reduction
B. Roasting
C. Calcination
D. Smelting
Answer : B

46. Styrene is produced from ethyl benzene by the process of
A. Dehydrogenation
B. Oxidation
C. Alkylation
D. Dehydration
Answer : A

47. The main product of high temperature carbonisation of coal is
A. Coke
B. Ammonia
C. Tar
D. Phenol
Answer : A

48. Which of the following is an endothermic reaction?
A. Absorption of SO₃ in 98% H₂SO₄
B. C + H₂O = CO + H₂
C. Thermal dissociation of iron pyrites
D. Both (B) and (C)
Answer : D

49. Which of the following is a constituent of vinegar?
A. Around 10% alcohol
B. Around 1% acetic acid
C. Both (A) and (B)
D. Neither (A) nor (B)
Answer : C

50. Bromine is used in the preparation of
A. Fire extinguishing compounds
B. Fire proofing agents
C. Dyes and antiknock compounds
D. All (A), (B) and (C)
Answer : D