Q1
Which of the following plots correctly represents the behaviour of an ideal binary liquid
solution ?
(a) Plot of xA (mole fraction of A in liquid phase) versus yA (mole fraction of A in
vapour phase) is linear
(b) Plot of xA versus yB is linear
(c) Plot of l/xA versus 1/yA is linear
(d) Plot of 1/xA versus 1/yB is linear
Q 2.
The vapour pressure of a deliquescent substance is:
(a) equal to the atmospheric pressure
(b) equal to that of the water vapour in air
(c) greater than that of the water vapour in air
(d) less than that of the water vapour in air
Q 3.
In the depression of freezing point experiment. it is found that :
(a) the vapour pressure of the solution is less than that of pure solvent
(b) the vapour pressure of solution is more than that of pure solvent
(c) only solute molecules solidify at the freezing point
(d) none of the above
Q 4.
Consider the following statements.
1. Isotonic solutions have the same molar concentration at a given temperature.
2. The molal elevation constant Kb is characteristic of a solvent, and is independent of the
solute added.
3. The freezing point of a 0.1 M aqueous KCl solution is more than that of a 0.1 M
aqueous AlCl3 solution. Which of these statements is correct ?
(a) l and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
5.
The plot of 1/xA versus 1/yA (where xA and yA are the mole fractions of A in liquid and
vapour phases respectively) is linear whose slope and intercept respectively are given as:
(a) P0 A/P0B, (P A - P B)/ P B
(b) P0 A/P0B, (P B - P A)/ P B
0
0
(c) P B/P A, (P A - P B)/ P B
(d) P0 B/P0A, (P B - P A)/ P B
Q 6.
A binary liquid (AB) shows positive deviation from Raoult’s law when:
(a) PA < PA° X Aliq and PA < PB X Bliq
(b) intermolecular forces; A - A, B - B > A - B
(c) Vmix < 0
(d) Hmix > 0
Q 7.
A liquid is in equilibrium with its vapours at its boiling point. On average, the molecules
in the two phases have equal :
(a) intermolecular forces
(b) potential energy
(c) total energy
(d) kinetic energy
Q 8.
According to Raoult’s law the relative decrease in the solvent vapour pressure over the
solution is equal to:
(a) the mole fraction of the solvent
(c) the number of moles of the solute
Q 9.
(b) the mole fraction of the solute
(d) none of the above
1 mole of ferric oxalate is oxidised by x mole of MnO4 and also 1 mole of ferrous
oxalate is oxidised by y moles of MnO4 in acidic medium. The ratio of x/y is:
(a) 2 : 1
(b) 1 : 2
(c) 3 : 1
(d) 1 : 3
Q 10. The expression relating mole fraction of solute X1 and molarity (M) of the solution is :
MM 1
M (M 1  M 2 )  d
(a) X 1 
(b) X 1 
M (M 1  M 2 )  d
MM 1
MM 1
M (M 1  M 2 )  d
(c) X 1 
(d) X 1 
M (M 1  M 2 )  d
MM 1
Q 11. Choose incorrect statement for a binary solution which show negative deviation from
Raoult’s law:
(a) The negative deviation from linearity diminishes and tends to zero as the
concentration of the solution component approaches unity
(b) When solutions form, their volumes are smaller than. the sum of the volumes of their
components
(c) Heat is released during the formation of the solution
(d) H is evolved during the formation of the solution
Q 12. The degree of dissociation () of a weak electrolyte AxBy is related to van’t Hoff factor
(i) by the expression:
i 1
i 1
x  y 1
x  y 1
(a)  
(b)  
(c)  
(d)  
i 1
i 1
( x  y  1)
( x  y  1)
Q 13. Solubility of a solute in a solvent (say H2O) is dependent on temperature as
given by S = A e-H/RT where H is heat of reaction solute + H2O
solution, H = ± x For given solution variation of log S with temperature is
shown graphically. Hence, solute is:
(a) CuSO4 5H2O
(b) Nacl
(c) sucrose
(d) CaO
Q 14. When mercuric iodide is added to an aqueous solution of KI, the:
(a) freezing point is raised
(b) freezing point is lowered
(c) boiling point does not change
(d) freezing point does not change
Q 15. The following two graphs are plotted between the temperature and mole fraction of the
components of two different azeotropic mixtures, (X1 = mole fraction of solvent).
(A)
(B)
Choose the correct options:
(a) graph A represents maximum bp and minimum vp
(b) graph B represents minimum bp and maximum vp
(c) graph B represents maximum bp and minimum vp
(d) none of the above
Q 16. The normality of orthophosphoric acid having purity of 70% by wt. (sp. gr. 1.54) would
be:
(a)11N
(b)22N
(c) 33N
(d) 44N
Q 17. When a solute is added to a pure solvent, the:
(a) vapour pressure of the solution becomes higher than that of the pure solvent
(b) rate of evaporation of the pure solvent is increased
(c) solute does not affect the rate of condensation
(d) rate of evaporation of the solution is not equal to the rate of condensation of the
solution at a lower vapour pressure than that in the case of the pure solvent
Q 18. The percentage composition by weight of an aqueous solution of a solute (molecular
mass 150) which boils at 373.26 is (Kb = 0.52):
(a) 5
(b) 15
(c) 7
(d) none of these
Q 19. The following is a graph plotted between the vapour pressures of two volatile liquids
against their respective mole fractions. Which of the following
combinations are correct?
(a) When xA = 1 and xB = 0, then P PA0
(b) When xB = 1 and xA = 0, then P > PA0
(c) When xA = 1 and xB = 0, then P < PB0
(d) When xB = 1 and xA = 0, then P = PB0
Q 20. The freezing point of a dilute solution of acetamide in glacial acetic acid is 298 K. This is
the value when crystals of :
(a) acetamide first appears
(b) acetic acid first appears
(c) both appear together
(d) ice first appears
Q 21. If in solvent, n simple molecules of solute combine to k form an associated molecule, x is
degree of association, the van’t Hoff’s factor i is equal to:
(a)
1
1  nx
(b)
1  x  nx
1
1 x 
(c)
1
x
n
x
1  x
n
(d)
1
Q 22. Study the following figure, and choose the correct options:
(a) there will be no movement of any solution across the membrane
(b) BaCl2 will flow towards the NaCl solution
(c) NaCI will flow towards the BaCl2 solution
(d) any among (b) and (c)
Q 23. For a dilute solution containing ,a nonvolatile solute, which of the following
expressions correctly represents the molar mass of solute ?
m2
m2
(a) M 2 
(b) M 2 
(m1 / M 1 )
(m1 / M 1 )  (p / p10 )
(c) M 2 
m2
( M 1 / m1 )( p / p10 )
m M 
(d) M 2   2 1 (p / p10 )
 m1 
Q 24. The decrease in the freezing point of an aqueous solution of a substance is 1.395 K and
that in the freezing point of a benzene solution of the same substance is 1.280 K. Explain
the difference in T. The substance:
(a) dissociates in the aqueous solution as well as in the benzene solution
(b) forms complexes in solution
(c) associates in the benzene solution
(d) dissociates in the aqueous solution and not in the benzene solution
Q 25. How many grams of sucrose (M. wt. = 342) should be dissolved in 100 g water in order
to produce a solution with a 105.0°C difference between the freezing point and the
boiling temperatures ?
(Kf =1.86°C/m, Kb = 0.51°C/m) :
(a) 34.2g
(b) 72g
(c) 342 g
(d) 460 g
Q 26. A graph is plotted with the temperature of a solution containing
benzene and toluene as a function of mole fraction. Choose the
incorrect options:
(a) a  b represents evaporation
condensation
(c) c  d represents evaporation
condensation
(b) b  c represents
(d) c  d represents
Q 27. The molarity of NO3 in the solution after 2 L of 3 M AgNO3 is mixed with 3 L of 1 M
BaCl2 is:
(a) 1.2 M
(b) 1.8 M
(c) 0.5 M
(d) 0.4 M
Q 28. Choose the correct option:
(a) A represents vapour composition and B liquid composition
(b) A as well as B represent liquid composition
(c) both A and B represent vapour composition
(d) A represents liquid composition and B vapour composition
Q 29. 0.2 mole of HCl and 0.1 mole of calcium chloride were dissolved in water to have 500
mL of solution. The molarity of Cl- ions in the solutions is:
(a) 0.04 M
(b) 0.8 M
(c) 0.4 M
(d) 0.08 M
Q 30. In which of the following pairs of solutions will the values of the van’t Hoff factor be the
same?
(a) 0.05 M K4[Fe(CN)6] and 0.10 M FeSO4
(b) 0.20 M NaCl and 0.10 M BaCl2
(c) 0.05 M FeSO4 (NH4)2SO4. 6H2O and 0.02 M KCl.MgCl2. 6H2O
(d) all have same value
Q 31. Which of the following is/are not affected by temperature?
(a) Molarity
(b) Molality
(c) Normality
(d) None of these
Q 32. Solute A is a ternary electrolyte and solute B is a non-electrolyte. If 0.1 M solution of
solute B produces an osmotic pressure of 2P, then 0.05 M solution of A at the same
temperature will produce an osmotic pressure equal to
(a) 1.5 P
(b) 2 P
(c) 3 P
(d) P
Q 33. One litre of water under a pressure of 1 atm dissolves 0.02 g of N2 at 20°C. Calculate
Henry’s law constant:
(a) 7.75 × 102
(b) 2× 102
(c) 7.75 × 104
(d) 7.75 × 105
Q 34. The azeotropic solutions of two miscible liquids:
(a) can be separated by simple distillation
(b) are supersaturated solutions
(c) behave like a single component and boil at a constant temperature
(d) none of the above
Q 35. Which of the following form/s ideal solution ?
(a) Ethyl bromide + ethyl iodide
(b) Ethyl alcohol + water
(c) Chloroform + benzene
(d) Benzene + water
Answers
1.
8.
15.
22.
29.
c
b
c
b
b
2.
9.
16.
23.
30.
d
a
c
b
c
3.
10.
17.
24.
31.
a
c
c
d
b
4.
11.
18.
25.
32.
d
d
c
b
c
5.
12.
19.
26.
33.
b
a
d
d
b
6.
13.
20.
27.
34.
b
d
b
a
c
7.
14.
21
28
35.
d
a
c
d
a