UPSC CSE - Chemical Process 1000+ MCQ [Solved] PDF Download

1. Magnesium and calcium __________ cause temporary hardness of water.
A. Carbonates
B. Bicarbonates
C. Phosphates
D. Sulphates
Answer : B

2. Which is a high grade pulp?
A. Rag pulp
B. Mechanical pulp
C. Sulphate pulp
D. Sulphite pulp
Answer : C

3. 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

4. L.D. converter is used in the production of
A. Pig iron
B. Steel
C. Copper
D. Zinc
Answer : B

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

6. Nylon-6 as compared to Nylon-66 is having higher
A. Hardness
B. Abrasion/resistance
C. Melting point
D. None of these
Answer : D

7. 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

8. The major constituent of black liquor generated during paper manufacture is sodium
A. Sulphate
B. Carbonate
C. Hydroxide
D. Bi-carbonate
Answer : B

9. Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.
A. Hard
B. Soft
C. Metallic
D. Lubricating
Answer : B

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

11. Thermoplastic materials
A. Do not soften on application of heat
B. Are heavily branched molecules
C. Are solvent insoluble
D. None of these
Answer : D

12. Pick out the wrong statement.
A. DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction
B. Chloral is obtained by the chlorination of ethyl alcohol
C. Insecticides acting on the insects through the respiratory system are called fumigants
D. Benzene hexachloride is not a contact insecticide
Answer : D

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

14. 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

15. Cumene is the starting material for the production of
A. Benzoic acid
B. Phenol and acetone
C. Isoprene
D. Styrene
Answer : B

16. Unsaturated oils compared to saturated oils have
A. Lower melting point & higher reactivity to oxygen
B. Higher melting point & higher reactivity to oxygen
C. Lower melting point & lower reactivity to oxygen
D. Higher melting point & lower reactivity to oxygen
Answer : A

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

18. 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

19. Nylon-6 is manufactured from
A. Caprolactam
B. Hexamethylene diamine and adipic acid
C. Hexamethylene diamine and Maleic anhydride
D. Hexamethylene diamine and Sebacic acid
Answer : A

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

21. 'Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of
A. Final rolling out of paper
B. Cutting of fibres
C. Hydration of fibres
D. Fibrillation of fibre
Answer : A

22. The major use of butadiene is
A. As a plasticiser for unsaturated polyester
B. In the manufacture of synthetic rubber
C. As an anti-skinning agent in paint
D. None of these
Answer : B

23. 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

24. Production of one ton of cement requires about __________ tons of limestone.
A. 0.6
B. 1.2
C. 2.2
D. 3.8
Answer : B

25. Nylon-66 is so named because the
A. Average degree of polymerisation of the polymer is 1966
B. Number of carbon atoms between two nitrogen atoms are 6
C. Number of nitrogen atoms between two carbon atoms are 6
D. Polymer was first synthesised in 1966
Answer : A

26. Systemic insecticides
A. Are absorbed throughout the plant
B. Kill insects following external bodily contact
C. Are stomach poisons
D. Emit poisonous vapour
Answer : A

27. The temperature in the calcium carbide furnace is __________ °C.
A. 200-300
B. 700-850
C. 2000-2200
D. 4000-4500
Answer : C

28. 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

29. Main constituent of limestone is
A. CaCO₃
B. MgCO₃
C. Na₂CO₃
D. CaSO₄
Answer : A

30. Production of one ton of dry paper pulp requires about __________ tons of bamboo or wood.
A. 1
B. 2.5
C. 5
D. 10
Answer : B

31. The ideal pulp for the manufacture of paper should have high __________ content.
A. Cellulose
B. Lignin
C. Both (A) & (B)
D. None of these
Answer : A

32. Styrene butadiene rubber (SBR) is
A. A natural rubber
B. A synthetic polymer
C. A synthetic monomer
D. Another name of silicone rubber
Answer : B

33. Argon is the third largest constituent of air (followed by N₂ & O₂). Its percentage by volume in air is
A. 0.14
B. 0.34
C. 0.94
D. 1.4
Answer : C

34. 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

35. 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

36. Which of the following is not present in bagasse fibre?
A. Cellulose
B. Lignin
C. Pentogens
D. None of these
Answer : D

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

38. Transparent soaps (e.g. Pears) are
A. Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
B. Metallic soaps with frothing agent and free Stearic acid to achieve transparency
C. Metallic soaps with frothing agent from which glycerine has not been recovered
D. None of these
Answer : A

39. Presence of H₂S in raw water (to be chlorinated) results in the
A. Reduced softening capacity of zeolite
B. Increased dosage of chlorine to provide a disinfecting residual in the water
C. Easy removal of its hardness
D. None of these
Answer : B

40. Hydrazine (N₂H₄) is used mainly as a/an
A. Explosive
B. Rocket fuel
C. Detergents additive
D. None of these
Answer : B

41. Glycerine can be obtained from
A. Fat
B. Naphthalene
C. Cumene
D. Sucrose
Answer : A

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

43. 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

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

45. Commercial production of calcium carbide requires limestone and __________ as raw materials.
A. Coke
B. Sand
C. Soda ash
D. Fuel oil
Answer : B

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

47. Caprolactam (a raw material for nylon-6 manufacture) is produced from
A. Phenol
B. Naphthalene
C. Benzene
D. Pyridine
Answer : C

48. Nitro-glycerine absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as controlled explosive called dynamite. The raw material used for its manufacture are glycerine, nitric acid and
A. Sulphuric acid
B. Phosphoric acid
C. Hydrochloric acid
D. Hydrofluoric acid
Answer : A

49. 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

50. The basic constituent of vegetable oils is
A. Triglyceride
B. Fatty acids
C. Fatty alcohol
D. Mono esters
Answer : A