MULTIPLE CHOICE QUESTIONS

1. Out of molality (m), molarity (M), formality (F) and (a) 12.6 gm (b) 6.3 gm
mole fraction (x), those which are independent of (c) 4.5 gm (d) 9.0 gm
temperature are
11. Which of the following solutions has highest osmotic
(a) M, m (b) F, x
pressure?
(c) m, x (d) M, x (a) 1 M NaCl (b) 1 M MgCl2
2. The boiling point of an azeotropic mixture of water and (c) 1 M urea (d) 1M glucose.
ethanol is less than that of water and ethanol. The 12. Which of the following aqueous solutions containing
mixture shows 10 g of solute in each case, has highest m.pt?
(a) No deviation from Raoult’s Law. (a) NaCl solution
(b) Positive deviation from Raoult’s Law. (b) KC1.solution
(c) Negative deviation from Raoult’s Law. (c) Sugar solution
(d) That the solution is unsaturated. (d) Glucose solution.
3. Which has the lowest boiling point at 1 atm pressure? 13. The molal freezing point constant for water is 1.86°
(a) 0.1 M KCl (b) 0.1 M Urea CM. The freezing point of 0.1 M NaCl solution is
(c) 0.1 M CaCl2 (d) 0.1 M AlCl3 expected to be
4. People add sodium chloride to water while boiling (a) -1.86 degree C
eggs. This is to (b) -0.372 degree C
(a) Decrease the boiling point. (c) -0.186 degree C
(b) Increase the boiling point. (d) 0.372 degree C
(c) Prevent the breaking of eggs. 14. In case of electrolyte which dissociates in solution the
(d) Make eggs tasty. Van’t Hoff’s factor, i is
(a) > 1 (b) < 1
5. The van’t Hoff factor (i) accounts for
(c) = 1 (d) = 0
(a) Degree of solubilisation of solute.
(b) The extent of dissociation of solute. 15. The law stating that the relative lowering of vapour
(c) The extent of dissolution of solute. pressure is equal to the mole fraction of a solute in the
(d) The degree of decomposition of solution. solution is known as
(a) Henry’s law
6. The molal elevation constant depends upon (b) Van’t Hoff, Law
(a) Nature of solute. (c) Raoult’s law
(b) Nature of the solvent. (d) Ostwald’s dilution law
(c) Vapour pressure of the solution.
(d) Enthalpy change 16. Which of the following modes of expressing
concentration is independent of temperature?
7. The osmotic pressure of a solution is directly (a) Molarity (b) Normality
proportional to (c) Formality (d) Molality
(a) The molecular concentration of the solute
(b) The absolute temperature at a given concentration 17. A 500 g tooth paste sample has 0.2 g fluoride
(c) The lowering of vapour pressure concentration. What is the concentration of fluorine in
(d) All the above. terms of ppm level?
(a) 250 (b) 200
8. Which of the following is a colligative property? (c) 400 (d) 1000
(a) Osmotic pressure
(b) Boiling point 18. The average osmotic pressure of human bipod is 7.8
(c) Vapour pressure bar at 37°C. What is the concentration of an aqueous
(d) Electrical conductivity solution of NaCl that could be used in blood stream?
(a) 0.15 Mol L-1
9. Which of the following 0.1 M aqueous solutions will (b) 0.30 Mol L-1
have the lowest freezing point? (c) 0.60 Mol L-1
(a) Potassium sulphate (d) 0.45 Mol L-1
(b) Sodium chloride
19. Equimolar solutions in the same solvent have
(c) Urea
(a) Same B.Pt but different F.Pt
(d) Glucose
(b) Same F. Pt, but different B.Pts.
10. The mass of (COOH)2. 2H2O needed to prepare (c) Same Boiling and same freezing point
500dm3.of 0.1 Molar solution is (d) Different boiling and different freezing points.
20. The vapour pressure of the two liquids ‘P’ and ‘Q’ are 30. The law which indicates the relation’-hip between
80. and 60 torr respectively. The total vapour pressure solubility of a gas in liquid and pressure rs
of the solution obtained by mixing 3 Mol of P and 2 (a) Raoult’s law
Mole of Q would be (b) Henry’s law
(a) 68 torr (b) 140 torr (c) Lowering of vapour pressure
(c) 72 torr (d) 20 torr (d) Van’t Hoff law
21. If an aqueous solution of glucose is allowed to freeze, 31. Among the following substances the lowest vapour
then crystals of which substance will be separated and pressure is exerted by
first? (a) Water (b) Alcohol
(a) Glucose (c) Ether (d) Mercury
(b) Water 32. Partial pressure of a solution component is directly
(c) Both of these proportional to its mole fraction. This is known as
(d) None of these (a) Henry’s law
22. Two solutions of a substance (non-electrolyte) are (b) Raoult’s law
mixed in the following mariner: 480 ML of 1.5 M of first (c) Distribution law
solution + 520 ML of 1.2 M second solution. What is the (d) Ostawald’s dilution law
molarity of the final mixture?
33. Which of the following solutions shows positive
(a) 1.20 M (b) 1.50 M
deviation from Raoult’s law?
(c) 1.344 M (d) 2.70 M
(a) Acetone + Aniline
23. If a is the degree of dissociation of Na2SO4.the Van’t (b) Acetone + Ethanol
Hoff factor (i) used for calculating the molecular mass (c) Water + Nitric acid
is (d) Chloroform + Benzene
(a) 1.+ α (b) 1.– α
(c) 1.+ 2α (d) 1.– 2α 34. The system that forms maximum boiling azetrope is
(a) Acetone-chloroform
24. X is dissolved in water. Maximum boiling point is (b) ethanol-acetone
observed when X is ………… (0.1 M each) (c) n-hexane-n-heptane
(a) CuSO4 (b) BaCl2 (d) carbon disulphide-acetone
(c) NaCl (d) Urea
35. A plant cell shrinks when it is kept in a
25. The mole fraction of the solute in one molal aqueous (a) Hypotonic solution
solution is (b) Hypertonic solution
(a) 0.027 (b) 0.036 (c) Isotonic solution
(c) 0.018 (d) 0.019
(d) Pure water
26. The atmospheric pollution is generally measured in the
36. The relative lowering in vapour pressure is
units of
proportional to the ratio of number of
(a) Mass percentage (b) Volume percentage
(a) Solute molecules to solvent molecules
(c) Volume fraction (d) ppm
(b) Solvent molecules to solute molecules
27. A 5% solution of cane-sugar (molecular weight = 342) (c) Solute molecules to the total number of molecules
is isotonic with 1% solution of substance A. The in solution
molecular weight of X is (d) Solvent molecules to the total number of molecules
(a) 342 (b) 171.2 in solution
(c) 68.4 (d) 136.8
37. The osmotic pressure of a solution can be increased by
28. H2S is a toxic gas used in qualitative analysis. If (a) Increasing the volume
solubility of H2S in water at STP is 0.195 M. what is the (b) Increasing the number of solute molecules
value of KH? (c) Decreasing the temperature
(a) 0.0263 bar (b) 69.16 bar (d) Removing semipermeable membrane
(c) 192 bar (d) 282 bar 38. Sprinkling of salt helps in clearing the snow covered
29. Atomic mass is equal to roads in hills. The phenomenon involved in the process
(a) Number of electrons of an atom is
(b) Sum of the numbers of electrons and protons of an (a) Lowering in vapour pressure of snow
atom (b) Depression in freezing point of snow
(c) Sum of the numbers of neutrons and protons of an (c) Melting of ice due to increase in temperature by
atom putting salt
(d) None of these (d) Increase in freezing point of snow
39. For carrying reverse osmosis for desalination of water (d) Hydrogen in palladium
the material used for making semipermeable
50. Maximum amount of a solid solute that can be
membrane is
dissolved in a specified amount of a given liquid solvent
(a) Potassium nitrate (b) Parchment membrane
does not depend upon ________.
(c) Cellulose acetate (d) Cell membrane
(a) Temperature (b) Nature of solute
40. At equilibrium the rate of dissociation of a solid solute (c) Pressure (d) Nature of solvent
in a volatile liquid solvent is
(a) Less than the rate of crystallisation ASSERTION AND REASON
(b) Greater than the rate of crystallisation
(c) Equal to the rate of crystallisation Q1. Assertion: Molarity of a solution in liquid state
(d) Zero changes with temperature.
41. Which of the following fluoride is used as rat poison? Reason: The volume of a solution changes with change
(a) CaF2 (b) KF in temperature.
(c) NaF (d) MgF2 (a) If both Assertion and Reason are correct and the
Reason is a correct explanation of the Assertion.
42. Most of the processes in our body occur in (b) If both Assertion and Reason are correct but Reason
(a) Solid solution is not a correct explanation of the Assertion.
(b) Liquid solution (c) If the Assertion is correct but Reason is incorrect.
(c) Gaseous solution (d) If both the Assertion and Reason are incorrect.
(d) Colloidal solution Q2. Assertion: If a liquid solute more volatile than the
43. The term homogenous mixtures signifies that solvent is added to the solvent, the vapour pressure of
(a) Its composition is uniform throughout the mixture. the solution may increase i.e., ps > po.
(b) Its properties are uniform throughout the mixture. Reason: In the presence of a more volatile liquid
(c) Both composition and properties are uniform solute, only the solute will form the vapours and
throughout the mixture. solvent will not.
(d) Neither composition nor properties are uniform (a) If both Assertion and Reason are correct and the
throughout the mixture. Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason
44. Which of the following is a quantitative description of is not a correct explanation of the Assertion.
the solution? (c) If the Assertion is correct but Reason is incorrect.
(a) Dilute (b) Concentrated (d) If both the Assertion and Reason are incorrect.
(c) Saturated (d) Molar
45. When a solute is present in trace quantities the Q3. Assertion: If one component of a solution obeys
following expression is used Raoult’s law over a certain range of composition, the
(a) Gram per million (b) Milligram percent other component will not obey Henry’s law in that
(c) Microgram percent (d) Parts per million range.
Reason: Raoult’s law is a special case of Henry’s law.
46. What weight of glycerol should be added to 600 g of (a) If both Assertion and Reason are correct and the
water in order to lower its freezing point by 10°C ? Reason is a correct explanation of the Assertion.
(a) 496 g (b) 297 g (b) If both Assertion and Reason are correct but Reason
(c) 310 g (d) 426 g is not a correct explanation of the Assertion.
47. What will be the degree of dissociation of 0.1 M (c) If the Assertion is correct but Reason is incorrect.
Mg(NO3)2. solution if van’t Hoff factor (d) If both the Assertion and Reason are incorrect.
is 2.74? Q4. Assertion: Azeotropic mixtures are formed only by
(a) 75% (b) 87% non-ideal solutions and they may have boiling points
(c) 100% (d) 92% either greater than both the components or less than
48. If 2 gm of NaOH is present is 200 Ml of its solution, its both the components.
molarity will be Reason: The composition of the vapour phase is same
(a) 0.25 (b) 0.5 as that of the liquid phase of an azeotropic mixture.
(c) 5 (d) 10 (a) If both Assertion and Reason are correct and the
Reason is a correct explanation of the Assertion.
49. From the below options, choose the correct example (b) If both Assertion and Reason are correct but
for gaseous solutions. Reason is not a correct explanation of the
(a) Oxygen dissolved in water Assertion.
(b) Camphor in nitrogen gas (c) If the Assertion is correct but Reason is incorrect.
(c) Carbon dioxide dissolved in water (d) If both the Assertion and Reason are incorrect.