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Work Sheet Chemistry

Solutions
1. Out of molality (m), molarity (M), formality (F) 8. Which of the following is a colligative property?
and mole fraction (x), those which are (1) Osmotic pressure
independent of temperature are (2) Boiling point
(1) M, m (2) F, x (3) Vapour pressure
(3) m, x (4) M, x (4) Electrical conductivity

2. The boiling point of an azeotropic mixture of 9. Which of the following 0.1 M aqueous solutions
water and ethanol is less than that of water and will have the lowest freezing point?
ethanol. The mixture shows (1) Potassium sulphate
(2) Sodium chloride
(1) No deviation from Raoult’s Law.
(3) Urea
(2) Positive deviation from Raoult’s Law.
(4) Glucose
(3) Negative deviation from Raoult’s Law.
(4) That the solution is unsaturated.
10. The mass of (COOH)2. 2H2O needed to prepare
500dm3.of 0.1 Molar solution is
3. Which has the lowest boiling point at 1 atm (1) 12.6 gm (2) 6.3 gm
pressure? (3) 4.5 gm (4) 9.0 gm
(1) 0.1 M KCl (2) 0.1 M Urea
(3) 0.1 M CaCl2 (4) 0.1 M AlCl3 11. Which of the following solutions has highest
osmotic pressure?
4. People add sodium chloride to water while (1) 1 M NaCl (b) 1 M MgCl2
boiling eggs. This is to (c) 1 M urea (d) 1M glucose
(1) Decrease the boiling point.
(2) Increase the boiling point. 12. Which of the following aqueous solutions
(3) Prevent the breaking of eggs. containing 10 g of solute in each case, has highest
(4) Make eggs tasty. m.pt?
(1) NaCl solution (2) KC1.solution
5. The van’t Hoff factor (i) accounts for (3) Sugar solution (4) Glucose solution.
(1) Degree of solubilisation of solute.
(2) The extent of dissociation of solute. 13. The molal freezing point constant for water is
(3) The extent of dissolution of solute. 1.86° CM. The freezing point of 0.1 M NaCl
(4) The degree of decomposition of solution. solution is expected to be
(1) –1.86 degree C (2) –0.372 degree C
(3) –0.186 degree C (4) 0.372 degree C
6. The molal elevation constant depends upon
(1) Nature of solute.
14. In case of electrolyte which dissociates in
(2) Nature of the solvent.
solution the Van’t Hoff’s factor, i is
(3) Vapour pressure of the solution.
(1) > 1 (2) < 1
(4) Enthalpy change (3) =1 (4) = 0

7. The osmotic pressure of a solution is directly 15. The law stating that the relative lowering of
proportional to vapour pressure is equal to the mole fraction of a
(1) The molecular concentration of the solute solute in the solution is known as
(2) The absolute temperature at a given (1) Henry’s law
concentration (2) Van’t Hoff, Law
(3) The lowering of vapour pressure (3) Raoult’s law
(4) All the above (4) Ostwald’s dilution law
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16. Which of the following modes of expressing 24. X is dissolved in water. Maximum boiling point
concentration is independent of temperature? is observed when X is ................ (0.1 M each)
(1) Molarity (2) Normality (1) CuSO4 (2) BaCl2
(3) Formality (4) Molality (3) NaCl (4) Urea

17. A 500 g tooth paste sample has 0.2 g fluoride 25. The mole fraction of the solute in one molal
concentration. What is the concentration of aqueous solution is
fluorine in terms of ppm level? (1) 0.027 (2) 0.036
(1) 250 (2) 200 (3) 0.018 (4) 0.019
(3) 400 (4) 1000
26. The atmospheric pollution is generally measured
18. The average osmotic pressure of human bipod is in the units of
7.8 bar at 37°C. What is the concentration of an (1) Mass percentage (2) Volume percentage
aqueous solution of NaCl that could be used in (3) Volume fraction (4) ppm
blood stream?
(1) 0.15 Mol L-1 (2) 0.30 Mol L-1 27. A 5% solution of cane-sugar (molecular weight =
(3) 0.60 Mol L-1 (4) 0.45 Mol L-1 342) is isotonic with 1% solution of substance A.
The molecular weight of X is
19. Equimolar solutions in the same solvent have (1) 342 (2) 171.2
(1) Same B.Pt but different F.Pt (3) 68.4 (4) 136.8
(2) Same F. Pt, but different B.Pts.
(3) Same Boiling and same freezing point 28. H2S is a toxic gas used in qualitative analysis. If
solubility of H2S in water at STP is 0.195 M. what
(4) Different boiling and different freezing
is the value of KH?
points.
(1) 0.0263 bar (2) 69.16 bar
(3) 192 bar (4) 282 bar
20. The vapour pressure of the two liquids ‘P’ and
‘Q’ are 80. and 60 torr respectively. The total
29. Atomic mass is equal to
vapour pressure of the solution obtained by
(1) Number of electrons of an atom
mixing 3 Mol of P and 2 Mole of Q would be
(2) Sum of the numbers of electrons and
(1) 68 torr (2) 140 torr
protons of an atom
(3) 72 torr (4) 20 torr
(3) Sum of the numbers of neutrons and
protons of an atom
21. If an aqueous solution of glucose is allowed to (4) None of these
freeze, then crystals of which substance will be
separated and first? 30. The law which indicates the relationship between
(1) Glucose (2) Water solubility of a gas in liquid and pressure rs
(3) Both of these (4) None of these (1) Raoult’s law
(2) Henry’s law
22. Two solutions of a substance (non-electrolyte) (3) Lowering of vapour pressure
are mixed in the following mariner: 480 ML of (4) Van’t Hoff law
1.5 M of first solution + 520 ML of 1.2 M second
solution. What is the molarity of the final 31. Among the following substances the lowest
mixture? vapour pressure is exerted by
(1) 1.20 M (2) 1.50 M (1) Water (2) Alcohol
(3) 1.344 M (4) 2.70 M (3) Ether (4) Mercury

23. If a is the degree of dissociation of Na2SO4.the 32. Partial pressure of a solution component is
Van’t Hoff factor (i) used for calculating the directly proportional to its mole fraction. This is
molecular mass is known as
(1) 1.+ α (2) 1.– α (1) Henry’s law
(3) 1.+ 2α (4) 1.– 2α (2) Raoult’s law
(3) Distribution law
(4) Ostawald’s dilution law
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33. Which of the following solutions shows positive 40. At equilibrium the rate of dissociation of a solid
deviation from Raoult’s law? solute in a volatile liquid solvent is
(1) Acetone + Aniline (1) Less than the rate of crystallisation
(2) Acetone + Ethanol (2) Greater than the rate of crystallisation
(3) Water + Nitric acid (3) Equal to the rate of crystallisation
(4) Chloroform + Benzene (4) Zero

34. The system that forms maximum boiling azetrope 41. Which of the following fluoride is used as rat
is poison?
(1) Acetone-chloroform (1) CaF2 (2) KF
(2) ethanol-acetone (3) NaF (4) MgF2
(3) n-hexane-n-heptane
(4) carbon disulphide-acetone 42. Most of the processes in our body occur in
(1) Solid solution (2) Liquid solution
35. A plant cell shrinks when it is kept in a (3) Gaseous solution (4) Colloidal solution
(1) Hypotonic solution
(2) Hypertonic solution 43. The term homogenous mixtures signifies that
(3) Isotonic solution (1) Its composition is uniform throughout the
(4) Pure water mixture.
(2) Its properties are uniform throughout the
36. The relative lowering in vapour pressure is mixture.
proportional to the ratio of number of (3) Both composition and properties are
(1) Solute molecules to solvent molecules uniform throughout the mixture.
(2) Solvent molecules to solute molecules (4) Neither composition nor properties are
(3) Solute molecules to the total number of uniform throughout the mixture.
molecules in solution
(4) Solvent molecules to the total number of 44. Which of the following is a quantitative
molecules in solution description of the solution?
(1) Dilute (2) Concentrated
37. The osmotic pressure of a solution can be (3) Saturated (4) Molar
increased by
(1) Increasing the volume 45. When a solute is present in trace quantities the
(2) Increasing the number of solute molecules following expression is used
(3) Decreasing the temperature (1) Gram per million
(4) Removing semipermeable membrane (2) Milligram percent
(3) Microgram percent
38. Sprinkling of salt helps in clearing the snow (4) Parts per million
covered roads in hills. The phenomenon involved
in the process is 46. What weight of glycerol should be added to 600
(1) Lowering in vapour pressure of snow g of water in order to lower its freezing point by
(2) Depression in freezing point of snow 10°C ?
(3) Melting of ice due to increase in (1) 496 g (2) 297 g
temperature by putting salt (3) 310 g (4) 426 g
(4) Increase in freezing point of snow
47. What will be the degree of dissociation of 0.1 M
39. For carrying reverse osmosis for desalination of Mg(NO3)2 solution if van’t Hoff factor is 2.74?
water the material used for making (1) 75% (2) 87%
semipermeable membrane is (3) 100% (4) 92%
(1) Potassium nitrate
(2) Parchment membrane 48. If 2 gm of NaOH is present is 200 Ml of its
(3) Cellulose acetate solution, its molarity will be
(4) Cell membrane (1) 0.25 (2) 0.5
(3) 5 (4) 10
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49. From the below options, choose the correct (1) If both Assertion and Reason are correct
example for gaseous solutions. and the Reason is a correct explanation of
(1) Oxygen dissolved in water the Assertion.
(2) Camphor in nitrogen gas (2) If both Assertion and Reason are correct
(3) Carbon dioxide dissolved in water but Reason is not a correct explanation of
(4) Hydrogen in palladium the Assertion.
(3) If the Assertion is correct but Reason is
50. Maximum amount of a solid solute that can be incorrect.
dissolved in a specified amount of a given liquid (4) If both the Assertion and Reason are
solvent does not depend upon ________. incorrect.
(1) Temperature (2) Nature of solute
(3) Pressure (4) Nature of solvent 54. Assertion: Azeotropic mixtures are formed only
by non-ideal solutions and they may have boiling
51. Assertion: Molarity of a solution in liquid state points either greater than both the components or
changes with temperature. less than both the components.
Reason: The volume of a solution changes with Reason: The composition of the vapour phase is
same as that of the liquid phase of an azeotropic
change in temperature.
mixture.
(1) If both Assertion and Reason are correct
(1) If both Assertion and Reason are correct
and the Reason is a correct explanation of
and the Reason is a correct explanation of
the Assertion.
the Assertion.
(2) If both Assertion and Reason are correct
(2) If both Assertion and Reason are correct
but Reason is not a correct explanation of
but Reason is not a correct explanation of
the Assertion. the Assertion.
(3) If the Assertion is correct but Reason is (3) If the Assertion is correct but Reason is
incorrect. incorrect.
(4) If both the Assertion and Reason are (4) If both the Assertion and Reason are
incorrect. incorrect.

52. Assertion: If a liquid solute more volatile than 55. For the same solution, the elevation in boiling
the solvent is added to the solvent, the vapour point has higher values than depression in
pressure of the solution may increase i.e., ps > po. freezing point.
Reason: In the presence of a more volatile liquid (1) True (2) False
solute, only the solute will form the vapours and
solvent will not. 56. A mixture of benzene and toluene is an ideal
(1) If both Assertion and Reason are correct solution.
and the Reason is a correct explanation of (1) True (2) False
the Assertion.
(2) If both Assertion and Reason are correct 57. For an ideal solution, ΔVmixing ≠ 0.
but Reason is not a correct explanation of (1) True (2) False
the Assertion.
(3) If the Assertion is correct but Reason is 58. Which of the following is not an example of a
incorrect. non-ideal solution showing negative deviation?
(4) If both the Assertion and Reason are (1) Carbon tetrachloride + Toluene
incorrect. (2) HNO3 + Water
(3) HCl + Water
53. Assertion: If one component of a solution obeys (4) Acetic acid + Pyridine
Raoult’s law over a certain range of composition,
the other component will not obey Henry’s law in 59. Which of the following is not an example of an
that range. Ideal solution?
Reason: Raoult’s law is a special case of Henry’s (1) Benzene + Toluene
law. (2) n-Hexane + n-Heptane
(3) Ethyl alcohol + Water
(4) Ethyl bromide + Ethyl chloride
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60. If 2 L, 4 L and 6 L of three separate solutions of 69. What is the normality of lead (II) nitrate if the
concentrations 1 M, 2 M and 3 M, respectively, density of its 26% (w/w) aqueous solution is
are mixed together then what is the concentration 3.105 g/mL? Take molar mass of lead (II) nitrate
of the resultant mixture? to be 331g/mol.
(1) 1.500 M (2) 2.333 M (1) 0.488 N (2) 2.437 N
(3) 6.000 M (4) 3.333 M (3) 4.878 N (4) 0.243 N

61. What is a solution called when the concentration 70. What is the observation on adding a solute crystal
of the solute equals its solubility in the solvent? to a supersaturated solution?
(1) Dilute (2) Saturated (1) The solute precipitates out of the solution
(3) Unsaturated (4) Supersaturated (2) It becomes a colloidal solution
(3) The solute dissolves in the solution
62. What is the molality of a solution formed when (4) The solution desaturates
58.5g of NaCl is dissolved in 2000 mL of water?
(1) 0.2925 m (2) 29.2500 m 71. What is pumice stone an example of?
(3) 0.5000 m (4) 0.0005 m (1) Solid aerosol (2) Emulsion
(3) Liquid aerosol (4) Solid foam
63. In a saturated solution with endothermic
dissolution, how does the concentration of 72. Which of the following is a true solution?
dissolved solute change with increasing then (1) Starch solution (2) Salt solution
decreasing temperature? (3) Ink (4) Blood
(1) Keeps increasing
(2) Keeps decreasing 73. What is camphor in N2 gas an example of?
(3) Increases and decreases (1) Gas in gas solution
(4) Decreases and increases (2) Solid in liquid solution
(3) Liquid in gas solution
64. Calculate the mole fraction of A if 25g of it is (4) Solid in gas solution
dissolved in 50 moles of B. Given the molar mass
of A is 25 g/mole. 74. What is an alloy of copper and zinc called?
(1) 0.9259 (2) 0.0196 (1) Solder (2) Bronze
(3) 0.5000 (4) 0.3333 (3) German silver (4) Brass

65. What is the molarity of a 15 ml, 2 M aqueous 75. Which of the following is not a solid solution?
solution when 285 ml of water is added to it? (1) Brass (2) Bronze
(1) 0.105 M (2) 0.400 M (3) Hydrated salts (4) Aerated drinks
(3) 0.100 M (4) 0.111 M
76. Acetic acid associates as dimers in benzene.
66. Consider 100 ml of 0.3 molar solution formed by What is the Van’t Hoff factor (i) if the degree of
dissolving 3.33g of XCl2 in water. What is the molar association of acetic acid is 50%?
mass of element X? (Atomic mass of Cl = 35.5) (1) 0.40 (2) 0.25
(1) 9 (2) 24 (3) 0.50 (4) 0.75
(3) 40 (4) 87
77. The pH of a 2 M solution of a weak monobasic
67. Iron (III) oxide chunks contain 80 ppm silica acid (HA) is 4. What is the value of the Van’t Hoff
(SiO2). What is the concentration of this impurity factor?
in mass%? (1) 1.00005 (2) 0.00005
(1) 8.000% (2) 0.008% (3) 1.005 (4) 1.0005
(3) 0.080% (4) 0.800%
78. Osmotic pressure of 0.4% urea solution is 1.64
68. What is the mole fraction of glycerin C3H5(OH)3 atm and that of 3.42% cane sugar is 2.46 atm.
in a solution containing 33g of glycerin, 60g When the above two solutions are mixed, the
isopropyl alcohol and rest water? osmotic pressure of the resulting solution is
(1) 0.359 (2) 0.258 (1) 0.82 atm (2) 2.06 atm
(3) 0.205 (4) 0.480 (3) 1.64 tm (4) 4.10 atm
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79. Relative lowering of vapour pressure of a dilute (2) The relative lowering of vapour pressure is
solution is 0.2. What is the mole fraction of the a colligative property
non- volatile solute? (3) Vapour pressure of a solution is lower than
(1) 0.8 (2) 0.5 the vapour pressure of the solvent
(3) 0.3 (4) 0.2 (4) The relative lowering of vapour pressure is
directly proportional to the original
80. Depression in freezing point is 6 K for NaCl pressure.
solution if kf for water is 1.86 K/kg/mol, amount
of NaCl dissolved in 1 kg water is 88. Assertion: When a solution is separated from the
(1) 3.42 (2) 1.62 pure solvent by a semi- permeable membrane, the
(3) 3.24 (4) 1.71 solvent molecules pass through it from pure
solvent side to the solution side
81. If a solution containing 0.072 g atom of sulphur Reason: Diffusion of solvent occurs from a
in 100 g of a solvent gave a freezing point region of high concentration solution to a region
depression of 0.84°C, the molecular formula of of low concentration solution.
sulphur in the solution is (1) If both Assertion and Reason are correct
(1) S6 (2) S7 and the Reason is a correct explanation of
(3) S8 (4) S9 the Assertion.
(2) If both Assertion and Reason are correct
82. The magnitude of colligative properties in all but Reason is not a correct explanation of
colloidal dispersions is ….than solution the Assertion.
(1) Lower (2) Higher (3) If the Assertion is correct but Reason is
(3) Both (4) None incorrect.
(4) If both the Assertion and Reason are
83. The molar freezing point constant for water is incorrect.
186°C/mol. If 342 g of cane sugar is dissolved in
1000 g of water, the solution will freeze at 89. Assertion: When NaCl is added to water a
(1) –1.86°C (2) 1.86°C depression in freezing point is observed.
(3) 3.92°C (4) 2.42°C Reason: The lowering of vapour pressure of a
solution causes depression in the freezing point.
84. The movement of solvent molecules through a (1) If both Assertion and Reason are correct
semipermeable membrane is called and the Reason is a correct explanation of
(1) Electrolysis (2) Electrophoresis the Assertion.
(3) Osmosis (4) Cataphoresis (2) If both Assertion and Reason are correct
but Reason is not a correct explanation of
85. The osmotic pressure of 0.2 molar solution of the Assertion.
urea at 27°C is (3) If the Assertion is correct but Reason is
(1) 4.92 atm (2) 1 atm incorrect.
(3) 0.2 atm (4) 27 atm (4) If both the Assertion and Reason are
incorrect.
86. Dry air is passed through a solution containing 10
g of a solute in 90 g of water and then through 90. Assertion: When methyl alcohol is added to
pure water. The loss in weight of solution is 2.5 g water, boiling point of water increases.
and that of pure solvent is 0.05 g. calculate the Reason: When a volatile solute is added to a
molecular weight of the solute. volatile solvent elevation in boiling point is
(1) 50 (2) 180 observed.
(3) 100 (4) 25 (1) If both Assertion and Reason are correct
and the Reason is a correct explanation of
87. Which of the following is correct? the Assertion.
(1) Relative lowering of vapour pressure is (2) If both Assertion and Reason are correct
independent of the nature of the solute and but Reason is not a correct explanation of
the solvent the Assertion.
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(3) If the Assertion is correct but Reason is 92. A solution shows positive deviation from
incorrect. Raoult's law when A−B molecular interaction
(4) If both the Assertion and Reason are forces are stronger than A−A or B−B interaction
incorrect. forces.
(1) True (2) False
91. Assertion: 1 M solution of KCl has greater
osmotic pressure than 1 M solution of glucose at 93. Lowering of vapour pressure is a colligative
the same temperature. property.
Reason: In solution, KCl dissociates to produce (1) True (2) False
more number of particles.
(1) If both Assertion and Reason are correct 94. The relative lowering of vapour pressure for a
and the Reason is a correct explanation of solution is equal to the mole fraction of solute
the Assertion. present in the solution.
(2) If both Assertion and Reason are correct (1) True (2) False
but Reason is not a correct explanation of
the Assertion.
(3) If the Assertion is correct but Reason is
incorrect.
(4) If both the Assertion and Reason are
incorrect.
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Work Sheet Answer Key Chemistry

Solutions
1. (3) 25. (3) 49. (2) 73. (4)
2. (2) 26. (4) 50. (3) 74. (4)
3. (2) 27. (3) 51. (1) 75. (4)
4. (2) 28. (4) 52. (3) 76. (4)
5. (4) 29. (3) 53. (2) 77. (1)
6. (2) 30. (2) 54. (2) 78. (2)
7. (4) 31. (4) 55. (2) 79. (4)
8. (1) 32. (2) 56. (1) 80. (2)
9. (1) 33. (2) 57. (2) 81. (1)
10. (2) 34. (1) 58. (1) 82. (1)
11. (1) 35. (2) 59. (3) 83. (1)
12. (3) 36. (3) 60. (2) 84. (3)
13. (3) 37. (2) 61. (2) 85. (1)
14. (1) 38. (2) 62. (3) 86. (3)
15. (3) 39. (3) 63. (4) 87. (2)
16. (4) 40. (3) 64. (2) 88. (2)
17. (3) 41. (3) 65. (3) 89. (1)
18. (1) 42. (2) 66. (3) 90. (4)
19. (3) 43. (3) 67. (2) 91. (1)
20. (3) 44. (4) 68. (3) 92. (2)
21. (2) 45. (4) 69. (3) 93. (1)
22. (3) 46. (2) 70. (1) 94. (1)
23. (3) 47. (2) 71. (4)
24. (1) 48. (1) 72. (2)