1. What are the two processes in distillation?
a) Distilling and freezing
b) Distilling and condensation reflux
c) Freezing and condensation reflux
d) Only condensation reflux
2. What are the basic methods of distillation?
a) Fractional distillation and simple distillation
b) Fractional distillation, destructive
distillation, and simple distillation
c) Steam distillation, simple distillation, and
gas distillation
d) Steam distillation and destructive
distillation
3. Who discovered distillation?
a) Jabir ibn Hayyan
b) Guldberg and Waage
c) Charles Chamberland
d) Clarence Birdseye
4.
5.
What apparatus is used in distillation?
a) Distillation flask, condenser, collection
vessel
b) Distillation flask, condenser
c) Condenser, collection vessel
d) Distillation flask, column
Where is the double distillation method used?
a) To prepare distilled water for laboratory
purposes
b) To produce distilled water for commercial
purposes
c) To produce wine for commercial purposes
d) To produce coffee for commercial purposes
6. What is the distillate in distillation?
a) Vapor collected from the mixture
b) Liquid present in the distillation column
c) Vapor introduced during distillation process
d) Liquid introduced during distillation
process
View Answer
7. Why is steel wool used in fractional
distillation?
a) Increases the surface area
b) Improves the separation between the liquids
c) Increases the surface area and improves the
separation between the liquids
d) Increases the surface area and the quality of
the distillate
8. Does vacuum distillation higher boiling point?
a) True
b) False
9. Which of the following is produced by triple
distillation method?
a) Coffee
b) Beer
c) Whisky
d) Wine
10. Why are porcelain pieces used in distillation?
a) To have uniform boiling
b) To hasten the process
c) To add weight for the substance
d) To absorb excess heat from the flask
11. How to calculate partial pressure?
a) Sum of the pressures of each individual gas
b) Total pressure multiplied by the mole
fraction of that gas
c) Sum of the mole fraction of each individual
gas
d) Total concentration multiplied by the mole
fraction of that gas
12. What is the use of partial pressure?
a) To predict the movement of gases
b) To predict the concentration change
c) To predict the pressure change
d) To predict the mole fraction
13. What is partial pressure of water vapor?
a) 23.8 mm Hg
b) 230.8 mm Hg
c) 2.38 mm Hg
d) 0.238 mm Hg
14. What is r value in pV= nRT?
a) 0.8314 J/mol•K
b) 831.4 J/mol•K
c) 83.14 J/mol•K
d) 8.314 J/mol•K
15. Which of the following component is constant
in Boyle’s law?
a) Concentration
b) Pressure
c) Temperature
d) Volume
16. Does partial pressure depend on temperature?
a) True
b) False
17. What is the limitation of Dalton’s law?
a) It implies only for real gases at low pressure
b) It implies only for real gases at high
pressure
c) It implies only for real gases at low
concentration
d) It implies only for real gases at high
concentration
18. Which of the following statements about
partial pressure are correct?
Statement 1: The partial pressure of each gas
in a mixture is not proportional to its mole
fraction.
Statement 2: The partial pressure of each gas is
the product of the total pressure and the mole
fraction of that gas.
a) True, False
b) True, True
c) False, True
d) False, False
19. In an experiment, the barometric pressure of
gas is 1.043 atm, Some H2 was collected over
water at 27.0°C. What is the partial pressure of
the dry H2 in the container?
a) 0.1021 atm
b) 102.1 atm
c) 10.21 atm
d) 1.021 atm
20. The pressure of a 2.74moles of a gas in a
container was 432.0 torr. What would the
pressure inside the container be if 5.05 moles
of the gas was in it?
a) 896.20 torr
b) 796.20 torr
c) 596.20 torr
d) 696.20 torr
21. What is distillation reflux ratio?
a) Ratio between the boil up rate and the takeoff rate
b) Product of boil up rate and the take-off rate
c) Sum of boil up rate and the take-off rate
d) Ratio between the take-off rate and boil up
rate
22. Are these statements about the binary
distillation true?
Statement 1: Binary distillation is a common
separation technique used in chemical process
industries.
Statement 2: During this process, the mixture
of components is separated by their phases.
a) True, False
b) True, True
c) False, True
d) False, False
23. What factors affect distillation?
a) Solubility
b) Relative volatility
c) Surface area
d) Solubility, relative volatility and surface
area
24. Which of the following is explained by using
McCabe-Thiele plot?
a) Distillation
b) Crystallization
c) Molecular separation
d) Freezing
25. What is Q in McCabe Thiele method?
a) Mole fraction of liquid in the feed
b) Concentration
c) Viscosity
d) Temperature
26. Can Murphree efficiency be greater than 100?
a) True
b) False
27. What are the limitations of McCabe Thiele
method?
a) Cannot analyze mixtures containing more
than 2 components
b) Cannot analyze freeze dry product
c) Cannot analyze mixtures at high
temperature
d) Cannot analyze mixtures at low temperature
28. What does high reflux ratio mean?
a) Higher purity of the distillate
b) Lower purity of the distillate
c) Collection rate will be higher
d) Does not depend on purity and collection
rate
29. Which of the following trays are used in
distillation?
a) Bubble cap tray, sieve deck tray
b) Bubble cap tray, pore sieve tray
c) Sieve deck tray, pore sieve tray
d) Bubble cap tray, multi-flow tray
30. Which of the following shape represents the
number of theoretical stages in McCabe-Thiele
plot?
a) Vertical line
b) Circle
c) Triangle
d) Square
31. How aniline and chloroform can be separated?
a) Sublimation
b) Condensation
c) Distillation
d) Evaporation
32. Which of the following is not separated
through the distillation process?
a) Acetone and water
b) Milk and water
c) Impurities in Sea water
d) Aniline and chloroform.
33. The process of distillation is used for the
liquids having ____________
a) Sufficient difference in their solubility
b) Sufficient difference in their melting point
c) Sufficient difference in their boiling point
d) None of the mentioned
34. What are the applications of steam
distillation?
a) Extract the inorganic compounds
b) To clean the equipment
c) Extract and isolate essential oils
d) To purify drinking water
35. What is the advantage of steam distillation?
a) Reduces decomposition of temperaturesensitive compounds
b) Reduces decomposition of inorganic
compounds
c) Increases the decomposition of temperaturesensitive compounds
d) Increases the decomposition of inorganic
compounds
36. Who invented steam distillation?
a) Avicenna
b) Charles Chamberland
c) Nicolas Appert
d) Clarence Birdseye
37. Is steam distillation used to isolate limonene?
a) True
b) False
38. Which of the following statements about steam
distillation are correct?
Statement 1: It cannot be applied under low
pressure.
Statement 2: Used in isolation of organic
compounds.
a) True, False
b) True, True
c) False, True
d) False, False
39. How to extract oil from cinnamon?
a) Steam distillation
b) Hydro distillation
c) Fractional distillation
d) Boiling
40. How long is steam distillation takes place for
lavender?
a) 2 hours
b) 3 hours
c) 4 hours
d) 5 hours
41. What is still in distillation terminology?
a) It is the apparatus to be used for distillation
b) It is the liquid that is collected in collection
flask
c) It is the end product obtained in distillation
d) It is the liquid injected during distillation
process
42. What are variants of the steam distillation
process?
a) Dry steam distillation
b) Hydro-distillation
c) Direct steam distillation
d) Dry steam distillation, direct steam
distillation and hydro-distillation
43. Which of the following is not true of steam
distillation?
a) Very long extraction times
b) High energy consumption
c) No need for subsequent separation steps
d) Very short extraction times
44. For a dilute solution, Raoult's law states that:
a) the lowering of vapor pressure is equal to
the mole fraction of solute
b) the relative lowering of vapor pressure is
equal to the mole fraction of solute
c) the relative lowering of vapor pressure is
proportional to the amount of solute in
solution
d) the vapor pressure of the solution is equal to
the mole fraction of solvent
45. The vapor pressure of a given liquid will
decrease if:
a) surface area of liquid is decreased
b) the volume of liquid in the container is
decreased
c) the volume of the vapor phase is increased
d) the temperature is decreased
46. Raoult's law is obeyed by each constituent of a
binary liquid solution when:
a) the forces of attractions between like
molecules are greater than those between
unlike molecules
b) the forces of attractions between like
molecules are smaller than those between
unlike molecules
c) the forces of attractions between like
molecules are identical with those between
unlike molecules
d) the volume occupied by unlike molecules
are different
47. The boiling point of an azeotropic mixture of
water-ethanol is less than that of both water
and ethanol. Then:
a) the mixture will show negative deviation
from Raoult's law
b) the mixture will show positive deviation
from Raoult's law
c) the mixture will show no deviation from
Raoult's law d) this mixture cannot be
considered as true solution
48. What phenomenon occurs when a solution’s
equilibrium vapor pressure equals the
surrounding atmospheric pressure?
a) Boiling
b) Melting
c) Condensation
d) Sublimation
49. What is the boiling point of water?
a) 100 °F
b) 671.67 °R
c) 373 °C
d) 212 °r
50. “Total pressure of gas mixture is the sum of
individual pressures”. Which law is reflected
in this statement?
a) Amagat’s law
b) Raoult’s law
c) Dalton’s law
d) Henry’s law
51. If a mixture of A and B boils at a temperature
lower than the boiling point of either of the
components, what kind of deviation does the
mixture show?
a) No deviation
b) Maximum and minimum deviation from
Raoult’s law
c) Negative deviation from Raoult’s law
d) Positive deviation from Raoult’s law
52. What deviation is shown by a mixture of
equimolar phenol and aniline?
a) Negative deviation
b) Positive deviation
c) No deviation
d) Alternating positive and negative
53. If ethanol and chloroform are present in a
molar ratio of 2:3 then what is the vapor
pressure at 20° C if vapor pressures of pure
liquids are 5.95 kPa and 21.17 kPa,
respectively?
a) 16.692 kPa
b) 15.082 kPa
c) 8.731 kPa
d) 12.038 kPa
54. Considering a binary solution of components A
and B obeys Raoult’s law, which of the
following is true?
a) Total vapor pressure cannot be related to
mole fraction of only one component
b) Total vapor pressure of one component
varies non-linearly with another component
c) A plot of vapor pressures of both
components gives a linear plot
d) Total vapor pressure of solution always
decreases with increase in mole fraction of a
component
55. A volatile liquid with vapor pressure 85 kPa
(at sea level, 25° C) is taken to the peak of Mt.
Everest. Which of the following is true?
a) The vapor pressure of the solution decreases
b) The solution will condense quickly than
when at sea level
c) The solution will vaporize quickly than
when at sea level
d) The vapor pressure of the solution increases
56. Which of the following is caused by the
addition of a non-volatile solute to a solvent?
a) Reduction in equilibrium of vapor pressure
of solution
b) Increase in melting point of the solution
c) Decrease in the boiling point of the solution
d) Osmosis of solute in the solution
57. What does the vapor pressure of solvent
containing a non-volatile solute, in a closed
system directly vary with?
a) Mole fraction of solute
b) Mole fraction of solvent
c) Molarity of solute
d) Molarity of solvent
58. Which of the following statements regarding
Ideal solutions is false?
a) Ideal solutions obey Raoult’s law under all
conditions of temperature and concentrations
b) There will be some change in volume on
mixing the components, i.e., ΔVmixing ≠ 0
c) There will be no change in enthalpy when
the two components are mixed, i.e.,
ΔHmixing = 0
d) There will be no change in volume on
mixing the components, i.e., ΔVmixing = 0
59. Which of the following is not an example of
an Ideal solution?
a) Benzene + Toluene
b) n-Hexane + n-Heptane
c) Ethyl alcohol + Water
d) Ethyl bromide + Ethyl chloride
60. A solution which does not obey Raoult’s law is
called a non-ideal solution.
a) True
b) False
61. Which of the following is false regarding NonIdeal solutions?
a) They do not obey Raoult’s law
b) ΔVmixing ≠ 0
c) ΔHmixing = 0
d) They form azeotropes
62. Which of the following is an example of a
non-ideal solution showing positive deviation?
a) Acetone + Carbon disulphide
b) Chlorobenzene + Bromobenzene
c) Chloroform + Benzene
d) Acetone + Aniline
63. Ideal solutions do not form azeotropes.
a) True
b) False
64. Which of the following is not an example of a
non-ideal solution showing negative
deviation?
a) HNO3 + Water
b) HCl + Water
c) Acetic acid + Pyridine
d) Carbon tetrachloride + Toluene
65. Which of the following is true regarding nonideal solutions with negative deviation?
a) The interactions between the components
are lesser than in the pure components
b) ΔVmixing = +ve
c) ΔHmixing = +ve
d) They form maximum boiling azeotropes
66. Which of the following cannot form an
azeotrope?
a) H2O + C2H5OH
b) CHCl3 + C2H5OH
c) HCl + H2O
d) Benzene + Toluene
67. Which of the following is true regarding
azeotropes?
a) An azeotrope does not exhibit the same
concentration in the vapor phase and the liquid
phase
b) Azeotropic mixtures cannot be separated
into their constituents by fractional distillation
c) In case of minimum boiling azeotropes, the
boiling point of the azeotrope is higher than
the boiling point of either of the pure
components
d) In case of maximum boiling azeotropes, the
boiling point of the azeotrope is lesser than the
boiling point of either of the pure components
68. If liquids A and B form an ideal solution, then
what is the Gibbs free energy of mixing?
a) > 0
b) < 0
c) = 0
d) Not Defined
69. 5 moles of liquid X and 10 moles of liquid Y
make a solution having a total vapour pressure
70 torr. The vapour pressures of pure X and
pure Y are 64 torr and 76 torr respectively.
Which of the following is true regarding the
described solution?
a) The solution shows positive deviation
b) The solution shows negative deviation
c) The solution is ideal
d) The solution has volume greater than the
sum of individual volumes
Colligative Properties
70. Which colligative property measurement is
best to use for compounds with a molar mass
greater than 5000 g/mol?
a. osmotic pressure
b. freezing point depression
c. boiling point elevation
d. vapor pressure lowering
e. titration
71. Colligative properties are all similar in that
they all
a. were discovered in college laboratories.
b. are due to solvent molecules linked together.
c. have no harmful side effects.
d. depend on the concentration of particles in
solution.
e. involve pressure.
72. A crystal is placed in a solution, and it
dissolves. The solution must have been
a. unsaturated.
b. saturated.
c. supersaturated.
d. dilute.
e. concentrated.
73. Which intermolecular force is most important
between a sodium ion and its neighbors in a
dilute NaCl(aq) solution?
a. ion-ion
b. ion-dipole
c. dipole-dipole
d. London dispersion
e. hydrogen bonding
74. How many of the following forces are found
in a model of the dissolution process? Heat of
solution, solvent viscosity, ionization energy,
lattice energy, solvation energy
a. 1
b. 2
c. 3
d. 4
e. 5
75. Which factor does not affect the solubility of a
solid electrolyte in a liquid solvent?
a. temperature
b. nature of the solvent
c. common ion
d. pressure
e. nature of the solute
76. Which of the following factors is important
only for the solubility of gases in solvents?
a. the nature of the solute.
b. the nature of the solvent.
c. the pressure of the gas.
d. the temperature.
e. the atmospheric pressure.
77. Which of the following units is useful in
relating the concentration of a solution with
its vapour pressure?
a.) mole fraction
b.) parts per million
c.) mass percentage
d.) molality
78. Which of the four colligative properties arises
in systems where there is an equilibrium
between a liquid solution phase and a second
liquid phase?
a) Lowering of vapor pressure
b) Lowering of melting point
c) Raising of boiling point
d) Osmotic pressure
79. As the concentration of a solute in a solution
increases, the freezing point of the solution
___________ and the vapor pressure of the
solution ___________.
a. increases, increases
b. increases, decreases
c. decreases, increases
d. decreases, decreases
80. The concentration unit used to calculate
boiling point elevation is
a. molarity
b. solubility
c. molality
d. mole fraction
81. Pressure has an appreciable effect only on the
solubility of ___________ in liquids.
a. gases
b. solids
c. liquids
d. all of the above