When mercuric iodide is added to the aqueous
solution of potassium iodide is
1. Freezing point is raised
2. Freezing point is lowered
3. Freezing point does not change
4. Boiling point does not change
What is the freezing point of a solution
containing 8.1 gm HBr in 100 gm water
assuming the acid to be 90% ionized?
(Kf for H2O = 1.86 k/m)
1. -1.860C
2. -0.3530C
3. -3.530C
4. 00C
60 gm of Urea is dissolved in 1100gm solution.
To keep Tf/kf as 1 mol/kg, water separated in
the form of ice is
1. 40 gm
2. 60 gm
3. 100 gm
4. 200 gm
At temperature 3270C and concentration ‘C’,
osmotic pressure of a solution is ‘P’, the same
solution at concentration ‘C/2’ at 4270C shows
osmotic pressure 2 atm, value of ‘P’ will be
1. 12/7
2. 24/7
3. 6/5
4. 5/6
75 g ethylene glycol is dissolved in 500 gram
water. The solution is placed in a refrigerator
maintained at a temperature of 263.7 K. What
amount of ice will separate out at this
temperature? (Kf for H2O = 1.86 K/molal)
1. 300 g
2. 200 g
3. 178 g
4. 258 g
Two bottles A and B contain 1 M and 1 m
aqueous solution of sulphuric acid respectively
1. A is more concentrated than B
2. B is more concentrated than A
3. Concentration of A = Concentration of B
4. It is not possible to compare to concentration
For an ideal binary liquid solution with
which of the following relations between xA
(mole fraction of A in liquid phase) and yA
(molefraction of a A in vapour phase) is correcctly
represented ?
1.
2.
3.
4. and can not be correlated with each other
On mixing 10 mL of acetone with 50 mL
chloroform the total volume of the solutions is
1. < 60 mL
2. > 60 mL
3. = 60 mL
4. Unpredictable
The vapour pressure of benzene and pure
toluene at 70°C are 500 mm and 200 mm Hg
respectively. If they form an ideal solution, what
is the mole fraction of benzene in a mixture
boiling at 70°C at a total pressure of 380 mm
Hg?
1. 0.20
2. 0.40
3. 0.60
4. 0.80
At a given temperature, total vapour pressure
(in Torr) of a mixture of volatile components A
and B is given P = 120 – 75 xB . Hence vapour
pressure of pure A and B respectively (in Torr)
are
1. 120, 75
2. 120, 195
3. 120, 45
4. 75, 45
Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of ions in the mixture will be
1. 0.1 M
2. 0.05 M
3. 0.2 M
4. 0.15 M
A 5.85% solution of NaCl has vapour pressure
closet to
1. 5.85% solution of urea
2. 2 m solution of glucose
3. 1 m solution of urea
4. 5.8% solution of glucose
K4[Fe(CN)6] is 50% dissociated then the value
of Van’t Hoff factor (i)
1. 2
2. 2.2
3. 2.5
4. 3
Two liquids X and Y from an ideal solution. The
mixture has a vapour pressure of 400 mm at 300
K when mixed in the molar ratio of 1 : 1 and a
vapour pressure of 350 mm when mixed in the
molar ratio of 1 : 2 at the same
temperature. The vapoure pressures of the two
pure liquids X and Y respectively are
1. 250 mm, 550 mm
2. 350 mm, 450 mm
3. 350 mm, 700 mm
4. 550 mm, 250 mm
Mole of K2SO4 to be dissolved in 12 moles water
to lower its vapour pressure by 10 mm of Hg at a
temperature at which vapour pressure of pure
water is 50 mm of Hg is
1. 3 mol
2. 0.5 mol
3. 1 mol
4. 2 mol