194
1.
Solution and Colligative properties
The 2 N aqueous solution of H 2 SO4 contains
8.
(a) 49 gm of H 2 SO4 per litre of solution
(b) 4.9 gm of H 2 SO4 per litre of solution
9.
(d) 9.8 gm of H 2 SO4 per litre of solution
6.
(d) CH 3 COCH 3 CHCl 3
The O.P. of equimolar solution of Urea, BaCl 2 and AlCl 3 ,
[DCE 2000]
AlCl 3 BaCl 2 Urea
(a) 1.58 gm
(b) 3.16 gm
(b) BaCl 2 AlCl 3 Urea
(c) 0.52 gm
(d) 0.31 gm
(c)
What weight of hydrated oxalic acid should be added for
complete neutralisation of 100ml of 0.2 N NaOH
[MP PMT 1997]
(a) 0.45 g
(b) 0.90 g
(c) 1.08 g
(d) 1.26 g
500g
tooth
paste
sample
has
(a) 250
(b) 200
(c) 400
(d) 1000
Urea BaCl 2 AlCl 3
(d) BaCl 2 Urea AlCl 3
10.
The osmotic pressure of a 5% solution of cane sugar at
150o C is (mol. wt. of cane sugar = 342)
[CPMT 1986; Manipal MEE 1995]
0.2g
fluoride
concentration. What is the concentration of F in terms of
ppm level
[AIIMS 1992]
5.
CCl 4 CHCl 3
(a)
[CPMT 1986]
solution ?
4.
(b) C6 H6 CH 3 COCH 3
will be in the order
The amount of KMnO4 required to prepare 100 ml of
0.1N solution in alkaline medium is
3.
(a) CH 3 COCH 3 CS 2
(c)
(c) 98 gm of H 2 SO4 per litre of solution
2.
Which one of the following non-ideal solutions shows the
negative deviation
11.
(a) 4 atm
(b) 3.4 atm
(c) 5.07 atm
(d) 2.45 atm
Which one of the following pairs of solutions can we expect
to be isotonic at the same temperature
[NCERT 1982]
(a) 0.1M urea and 0.1M NaCl
To 5.85gm of NaCl one kg of water is added to prepare
(b) 0.1M urea and 0.2M MgCl 2
of solution. What is the strength of NaCl in this solution
(mol. wt. of NaCl 58.5 )
[CPMT 1990; DPMT 1987]
(c)
(a) 0.1 Normal
(b) 0.1 Molal
(d) 0.1M Ca(NO3 )2 and 0.1M Na 2SO4
(c) 0.1 Molar
(d) 0.1 Formal
12.
The degree of dissociation of Ca(NO 3 ) 2 in a dilute aqueous
0.1M NaCl and 0.1M Na 2SO4
Which of the following would have the highest osmotic
pressure (assume that all salts are 90% dissociated)
[NCERT 1982]
solution containing 14g of the salt per 200g of water 100o C
(a) Decimolar aluminium sulphate
is 70 percent. If the vapour pressure of water at 100 C is
760 cm. Calculate the vapour pressure of the solution
(b) Decimolar barium chloride
[UPSEAT 2000]
7.
(a) 746.3 mm of Hg
(b) 757.5 mm of Hg
(c) 740.9 mm of Hg
(d) 750 mm of Hg
The vapour pressure of pure benzene at a certain temperature
is 200 mm Hg. At the same temperature the vapour pressure
of a solution containing 2g of non-volatile non-electrolyte
solid in 78g of benzene is 195 mm Hg. What is the molecular
weight of solid
[UPSEAT 2001]
(a) 50
(b) 70
(c) 85
(d) 80
(c) Decimolar sodium sulphate
(d) A solution obtained by mixing equal of (b) and (c) and
filtering
13.
Which solution will have the highest boiling point
[NCERT 1981]
(a) 1% solution of glucose in water
(b) 1% solution of sodium chloride in water
(c) 1% solution of zinc sulphate in water
(d) 1% solution of urea in water
Solution and Colligative properties
14.
The boiling point of a solution of 0.11 gm of a substance in
17.
15 gm of ether was found to be 0.1 C higher than that of
the pure ether. The molecular weight of the substance will
be (Kb 2.16)
[MP PET 2002]
15.
mass of the compound (K f 5.1 km 1 ) , (freezing point of
benzene = 5.5o C)
[AFMC 2000]
(b) 158
(a) 100
(b) 200
(c) 168
(d) 178
(c) 300
(d) 400
[Kb for benzene = 2.53 K mol1]
18.
depression in freezing point will be
[DPMT 2004]
19.
(b) 0.58 g mol 1
(c)
When 0.01 mole of sugar is dissolved in 100g of a solvent,
the depression in freezing point is 0.40 o . When 0.03 mole
of glucose is dissolved in 50 g of the same solvent, the
(a) 5.8 g mol 1
(a) 0.60 o
(b) 0.80 o
(c) 1.60 o
(d) 2.40 o
The freezing point of equimolal aqueous solution will be
highest for
[IIT 1990; DCE 2001]
(a) C6 H 5 NH 3 Cl (aniline hydrochloride)
58 g mol 1
(b) Ca(NO3 )2
(d) 0.88 g mol 1
16.
The freezing point of a solution containing 4.8 g of a
compound in 60 g of benzene is 4.48. What is the molar
(a) 148
The boiling point of benzene is 353.23 K. When 1.80 gm of
a nonvolatile solute was dissolved in 90 gm of benzene, the
boiling point is raised to 354.11 K. the molar mass of the
solute is
195
(c)
The boiling point of 0.1 molal aqueous solution of urea is
100.18 o C at 1 atm. The molal elevation constant of water
is
(a) 1.8
(b) 0.18
(c) 18
(d) 18.6
La(NO3 )3
(d) C6 H12 O6 (glucose)
20.
The Van't Hoff factor of the compound K 3 Fe(CN )6 is
(a) 1
(b) 2
(c) 3
(d) 4
196
Solution and Colligative properties
(SET -4)
1.
2.
(c) Wt. of H 2 SO4 per litre N eq. mass 2 49 = 98g.
12.
(a) In alkaline medium KMnO4 act as oxidant as follows.
13.
14.
Mass
1
Now, Normality
Eq. mass V( L)
(d) For complete neutralization equivalent of oxalic acid =
equivalent of NaOH =
F ions in PPm =
5.
(b) 5.85 g NaCl = 0.1 mol as it present in 1 kg of
Kb w 1000
Tb W
2.16 0.11 1000
158.40 ~
158 .
0.1 15
(c) The elevation (Tb ) in the boiling point
354.11K 353.23K 0.88K
Substituting these values in expression
0.2
10 6 400
500
(c)
water ; molality
15.
w 0.2 100
w 1.26 gm .
63
1000
4.
(b) m
Kb 2.16, w 0.11, W 15g, Tb 0.1
100
g 1.58 g.
mass 0.1 158
1000
(b) NaCl and ZnSO4 gives 2 ions but NaCl is more
ionic than ZnSO4 .
Hence its eq.wt . = m. wt . 158
w
NV
eq. wt 1000
Al 2 (SO4 )3 Deci-molar gives maximum ion. Hence, its
osmotic pressure is maximum.
2KMnO4 2KOH 2K2 MnO4 H2O (O)
3.
(a)
M Solute
Where, w weight of solute, W weight of solvent
wt .
5.85
=0.1molal
m wt . l 58.5 1
M solute
2.53 1.8 1000
58 gm mol 1
0.88 90
Hence, molar mass of the solute 58 gm mol 1
6.
(a)
7.
(d)
8.
(d) CH 3 COCH 3 CHCl 3 is non ideal solution which
P o Ps
P o Ps w M
n
80
n N
mW
Po
Po
0.18
1.8
0.1
16.
(a) Kb
17.
(d) m
18.
(d) Tf mk f
K f 1000 w
shown negative deviation.
9.
K b 1000 w
Tb W
(a) The particle come of AlCl 3 solution will be maximum
W Tf
0.40
AlCl 3 Al 3 3Cl 4
again Tf mk f
BaCl 2 Ba 2 2Cl 3
(c)
11.
(d) Osmotic pressure is a coligative properties equimolar
solution of Ca(NO3 )2 and Na 2 SO4 will produce same
(d) La(NO3 )3 will furnish four ions and thus will develop
more lowering in freezing point whereas glucose gives
only one particle and thus minimum lowering in
freezing point.
20.
number of solute particles.
CaNO 3 Ca 2 2NO3
Na 2 (SO4 ) 2 Na SO42
0.03 1000
4
50
2.4
19.
5 0.0821 1000 423
5.07 atm .
342 100
10.
5.1 1000 4.8
400 .
60 1.02
0.01 1000
kf kf 4
100
due to ionisation less in BaCl 2 and minimum in urea
More the number of particles in solution more is the
osmotic pressure a colligative properties.
***
(d) K3 [Fe(CN )6 ] 3K [Fe(CN )6 ]3 .
