Liquid Solutions (Advanced) - Practice Sheet, Class 12, Chemistry JEE Notes | EduRev

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JEE : Liquid Solutions (Advanced) - Practice Sheet, Class 12, Chemistry JEE Notes | EduRev

 Page 1


LEARNERS HABITAT
1] A tablet of vitamin ‘C’ is analysed for its ascorbic acid content. One tablet reacts exactly
with 20ml of 0.1 N NaOH solutions. The equivalent weight of ascorbic acid is 176. The
tablet contains —— mg if ascorbic acid
a) 0.352 b) 3.52 c) 35.3 d) 352
2] Twenty gram of a solute is added to 100 g of water at 25ºC. The vapour pressure of pure
water is 23.76 mm Hg, vapour pressure of solution is 22.41 mm Hg. The mass of this
solute that is required in 100 g water to reduce the vapour pressure to one-half of the
pure water is
a) 333 g b) 666 g c) 166 g d) 256 g
3] Vapour pressure of pure water is 40 mm. If a non-volatile solute is added to it vapour
pressure falls by 4 mm. Hence, molality of solution is –
a) 6.173 molal b) 3.0864 molal c) 1.543 molal d) 0.772 molal
4] The vapour pressure of pure liquid solvent A is 0.80 atm. When a non-volatile
substance B is added to the solvent, its vapour pressure drops to 0.60 atm; mole fraction
of the component B in the solution is
a) 0.50 b) 0.25 c) 0.75 d) 0.40
5] Vapour pressure of CCl
4
 at 25ºC is 143 mm Hg. If 0.5 gm of non-volatile solute (mol.
mass 65) is dissolved in 100 ml CCl
4
, then the vapour pressure of the solution at 25ºC is
–[Given: Density of CCl
4
 = 1.58 g/cm
3
]
a) 141.93 mm b) 94.39 mm c) 199.34 mm d) 143.99 mm
6] The vapour pressure of a liquid decreases by 10 torr when a non-volatile solute is
dissolved. The mole fraction of the solute in solution is 0.1. What would be the mole
fraction of the liquid if the decrease in vapour pressure is 20 torr, the same solute being
dissolved –
a) 0.2 b) 0.9 c) 0.8 d) 0.6
7] The vapour pressure of a solution of a non-volatile solute B in a solvent A is 95% of the
vapour pressure of the solvent at the same temperature. If the molecular weight of the
solvent is 0.3 times the molecular weight of the solute, what is the weight ratio of
solvent to solute?
a) 0.15 b) 5.7 c) 0.2 d) None of these
Practice Sheet SOLUTIONS
LEARNERS HABITAT, 97/1, 3rd Floor, Near NCERT Gate No. 01, Adhchini, New Delhi. +91-8510800081/82 
www.learnershabitat.ac.in
 
Page 1
Page 2


LEARNERS HABITAT
1] A tablet of vitamin ‘C’ is analysed for its ascorbic acid content. One tablet reacts exactly
with 20ml of 0.1 N NaOH solutions. The equivalent weight of ascorbic acid is 176. The
tablet contains —— mg if ascorbic acid
a) 0.352 b) 3.52 c) 35.3 d) 352
2] Twenty gram of a solute is added to 100 g of water at 25ºC. The vapour pressure of pure
water is 23.76 mm Hg, vapour pressure of solution is 22.41 mm Hg. The mass of this
solute that is required in 100 g water to reduce the vapour pressure to one-half of the
pure water is
a) 333 g b) 666 g c) 166 g d) 256 g
3] Vapour pressure of pure water is 40 mm. If a non-volatile solute is added to it vapour
pressure falls by 4 mm. Hence, molality of solution is –
a) 6.173 molal b) 3.0864 molal c) 1.543 molal d) 0.772 molal
4] The vapour pressure of pure liquid solvent A is 0.80 atm. When a non-volatile
substance B is added to the solvent, its vapour pressure drops to 0.60 atm; mole fraction
of the component B in the solution is
a) 0.50 b) 0.25 c) 0.75 d) 0.40
5] Vapour pressure of CCl
4
 at 25ºC is 143 mm Hg. If 0.5 gm of non-volatile solute (mol.
mass 65) is dissolved in 100 ml CCl
4
, then the vapour pressure of the solution at 25ºC is
–[Given: Density of CCl
4
 = 1.58 g/cm
3
]
a) 141.93 mm b) 94.39 mm c) 199.34 mm d) 143.99 mm
6] The vapour pressure of a liquid decreases by 10 torr when a non-volatile solute is
dissolved. The mole fraction of the solute in solution is 0.1. What would be the mole
fraction of the liquid if the decrease in vapour pressure is 20 torr, the same solute being
dissolved –
a) 0.2 b) 0.9 c) 0.8 d) 0.6
7] The vapour pressure of a solution of a non-volatile solute B in a solvent A is 95% of the
vapour pressure of the solvent at the same temperature. If the molecular weight of the
solvent is 0.3 times the molecular weight of the solute, what is the weight ratio of
solvent to solute?
a) 0.15 b) 5.7 c) 0.2 d) None of these
Practice Sheet SOLUTIONS
LEARNERS HABITAT, 97/1, 3rd Floor, Near NCERT Gate No. 01, Adhchini, New Delhi. +91-8510800081/82 
www.learnershabitat.ac.in
 
Page 1
8] A 6% (by weight) of non-volatile solute in isopentane at 300 K has a vapour pressure of
1426 mm Hg. 20 g of isopentane is now added to the solution. The resulting solution has
a vapour pressure of 1445 mm of Hg at the same temperature. Then:
ii).Vapour pressure of isopentane at 300 K is -
a) 1541.68 mm b) 770.89 mm c) 1212.46 m d) 981.32 mm
a) 39.68 mm b) 79.32 mm c) 58.56 mm d) 29.24 mm
9] Benzene and toluene form an ideal solution. The vapour pressure of benzene and
toluene are respectively 75 mm and 22 mm at 20ºC. If the mole fraction of benzene and
toluene in vapour phase are 0.63 and 0.37 respectively, then
i) The vapour pressure of mixture is -
10] 1 mole benzene (Pº = 42 mm) and 2 moles toluene (Pº = 36 mm) will have
a) Total vapour pressure 38 mm
b) Mole fraction of vapours of benzene above liquid mixture is 7/19
c) Ideal behaviour
d) All of the above
11] A solution of benzene (pº = 120 torr) and toluene (pº = 80 torr) has 2.0 mol of each
component. At equilibrium the mol fraction of toluene in vapour phase is -
a) 0.50 b) 0.25 c) 0.60 d) 0.40
12] The vapour pressure of pure liquid A at 300 K is 575 torr and that of pure liquid B is 390
torr. These two compounds form ideal liquid and gaseous mixtures. The mole fraction
of A in the vapour phase is 0.35. Then:
Composition of the liquid mixture is -
a) A = 27%, B = 73% b) A = 57 %, B = 43 %
c) A = 33%. B = 67% d) A = 30%, B = 70%
13] At a given temperature, the vapour pressures of pure A and pure B are 108 and 36 torr
respectively. What will be the mole fraction of B in the vapour phase which is in
equilibrium with a solution containing equimolar fractions of A and B under ideal
behaviour conditions?
a) 0.25 b) 0.33 c) 0.50 d) 0.60
Practice Sheet SOLUTIONS
LEARNERS HABITAT, 97/1, 3rd Floor, Near NCERT Gate No. 01, Adhchini, New Delhi. +91-8510800081/82 
www.learnershabitat.ac.in Page 2
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