Chemistry - Solutions
Exam Duration: 45 Mins Total Questions : 30
The ratio of the value of any colligative property for KCI solution to that for sugar is nearly
- (a)
1.0
- (b)
0.5
- (c)
2.0
- (d)
2.5
what is the mole fraction of water in a solution containing 1 mole of water in 4 moles of alcohol?
- (a)
0.2
- (b)
0.4
- (c)
0.6
- (d)
0.8
Frezing point is highest in which case of the following ?
- (a)
\(1 M C_6H_5NH_3Cl\)
- (b)
\(1 M Ca((NO_3)_3\)
- (c)
\(1 M La(NO_3)_2\)
- (d)
1 M glucose
Of the given methods for molecular weight determination, in which case the sensitivity of the method decreases with increase in molecular weight of the solute
- (a)
viscosity measurement method
- (b)
dialysis method
- (c)
osmotic pressure measurement method
- (d)
elevation of boiling point method
A X molal solution of a compound in benzene has mole fraction equal to 0.2. The molality of the solution is
- (a)
1.4
- (b)
2
- (c)
3.2
- (d)
14.0
Frezing point is highest in which case of the following ?
- (a)
\(1 M C_6H_5NH_3Cl\)
- (b)
\(1 M Ca((NO_3)_3\)
- (c)
\(1 M La(NO_3)_2\)
- (d)
1 M glucose
On mixing 20 ml of acetone with 60 ml chloroform, the total volume of the solution would be
- (a)
>80 ml
- (b)
<80 ml
- (c)
80 ml
- (d)
None of the above
Reverse osmosis is used for
- (a)
getting pure water by desalination of sea water
- (b)
preparing aerated water
- (c)
purification of colloidal solution
- (d)
None of the solution
The vapour pressure of a pure liquid A is 70 mm of Hg at 300 k. It forms an ideal solution is 0.2 and total pressure of the solution is 84 ml of Hg at 300 K. The vapour preesure of pure liquid B at 300 K would be
- (a)
140 mm of hg
- (b)
70 mm of hg
- (c)
35 mm of hg
- (d)
280 mm of hg
A solution contains 6 gram of urea in 100 gram of water. The concentration of the solution is
- (a)
1.0 molar
- (b)
0.1 molar
- (c)
1 molal
- (d)
0.1 molar
The elevation in boiling point would be highest for
- (a)
0.10 M glucose
- (b)
0.08 M barium chloride
- (c)
0.15 M potassium chloride
- (d)
0.06 M calcium nitrate
6.0 g of urea of molecular weight 60 was disolved in 9.9 moles of water .If the vapourpressure of pure water is \(p_o\), then the vapour pressure of the solution is
- (a)
\(0.10 p_o\)
- (b)
\(0.90 p_0\)
- (c)
\(0.99 p_o\)
- (d)
\(1.01 p_o\)
Two bottles A and B contain 1 M and 1 m aqueous solution of sulphuric acid respectively, then
- (a)
conc. of A = conc. of B
- (b)
A is more concentrated than B
- (c)
B is more concentrated than than A
- (d)
It is not possible to compare the concentration
The molarity of a solution obtained by mixing 750 ml of 0.5 M HCl with 250 ml of 2MHCl would be
- (a)
1.00 M
- (b)
1.00 M
- (c)
0.875 M
- (d)
NONE OF THESE
A substance will be deliquecent if its vapour pressure is
- (a)
equal to the atmospheric pressure
- (b)
less than that of water vapour in air
- (c)
equal to that of water of vapour in air
- (d)
greater than that of water vapour in air
With increase of temperature, which of these changes?
- (a)
molality
- (b)
mass fraction of solute
- (c)
fraction of solute present in water
- (d)
mole fraction
Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon
- (a)
temperature
- (b)
nature of solute
- (c)
pressure
- (d)
nature of solvent
At equilibrium, the rate of dissolution of a solid solute in a volatile solvent is
- (a)
less than the rate of crystallisation
- (b)
greater than the rate of crystallisation
- (c)
equal to the rate of crystallisation
- (d)
zero
What is the total number of moles of H2SO4 required to prepare 5.0 L of a 2.0 M solution of H2SO4 ?
- (a)
10
- (b)
5.0
- (c)
20
- (d)
2.5
What is the molality of a solution in which 18 g glucose (mol. wt. =180) is dissolved in 500 g of H2O?
- (a)
0.5 m
- (b)
0.2 m
- (c)
2 m
- (d)
1 m
Vapour pressure of pure'A' is 70 mm of Hg at 25o C. If it forms an ideal solution with 'B' in which mole fraction of A is 0.8 and vapour pressure of the solution is 84 mm of Hg at 25o C, then the vapour pressure of pure 'B' at 25o C is
- (a)
140 mm
- (b)
70 mm
- (c)
56 mm
- (d)
28 mm
Colligative properties of a solution depend upon
- (a)
nature of solute only
- (b)
nature of both solute and solvent
- (c)
number of solute particles
- (d)
number of solvent particles
Lowering of vapour pressure is highest for
- (a)
0.1 M BaCl2
- (b)
0.1 M glucose
- (c)
0.1 M MgSO4
- (d)
urea
We have three aqueous solutions of NaCl labelled as 'A', 'B' and ' and 'C' with concentration 0.1 M, 0.01 M and 0.001 M, respectively. The value of van't Hoff factor for these solutions will be in the order .......
- (a)
iA < iB < ic
- (b)
iA > iB > ic
- (c)
iA = iB =ic
- (d)
iA < iB > ic
On the basis of information given below mark the correct option.
Information
I. In bromoethane and chloroethane mixture, intermolecular interactions of A -- A and B -- B type are nearly same as A -- B type interactions.
II. In ethanol and acetone mixture, A -- A or B -- B type intermolecular interactions are stronger than A -- B type interactions.
III. In chloroform and acetone mixture, A -- A and B -- B type intermolecular interactions are weaker than A -- B type interactions.
- (a)
Solution II and III will follow Raoult's law
- (b)
Solution I will follow Raoult's law
- (c)
Solution II will show negative deviation from Raoult's law
- (d)
Solution III will show positive deviation from Raoult's law
Colligative properties are observed when
- (a)
a non - volatile solid dissolved in a volatile liquid
- (b)
a volatile liquid is dissolved in another volatile liquid
- (c)
a gas is dissolved in non - volatile liquid
- (d)
a volatile liquid is dissolved in another volatile liquid.
If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water \(\left( \Delta { T }_{ f } \right) ,\) when 0.01 mole sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kg mol-1)
- (a)
0.0372 K
- (b)
0.0558 K
- (c)
0.0744 K
- (d)
0.0186 K
The vapour pressure of water at 20o C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20o C, the vapour pressure of the resulting solution will be
- (a)
17.675 mm Hg
- (b)
15.750 mm Hg
- (c)
16.500 mm Hg
- (d)
17.325 mm Hg