JEE Main Chemistry - Solutions
Exam Duration: 60 Mins Total Questions : 30
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
When acetone and chloroform are mixed, hydrogen bonding takes place between them. Such a liquid pair will show
- (a)
positive deviation from Raoult's Law
- (b)
negative deviation from raoult's law
- (c)
slight increase in volume
- (d)
no deviation from raoult's law
In the above question molality of the solution would be
- (a)
2.8
- (b)
3.8
- (c)
4.8
- (d)
1.8
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
4.0 g NaOH is contained in one decilitre of a solution. THe mole fraction of NaOH is
- (a)
1.2
- (b)
0.017
- (c)
0.128
- (d)
1.017
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
Which one of the following conditions is not by an ideal solution?
- (a)
raoult's law isobeyed
- (b)
\(\triangle { H }_{ mix } = 0\)
- (c)
\(\triangle V_{mix} = 0 \)
- (d)
All the above
0.2 mole of HCL and 0.1 mole of \(CaCl_2\)were dissolved in water to have 500 ml of solution; the molality of C1 - ions is
- (a)
0.04 M
- (b)
0.08 M
- (c)
0.4 M
- (d)
0.8 M
6 g of urea dissolved in 90 g of water. The relative lowering of vapour pressure is equal to
- (a)
0.01
- (b)
0.02
- (c)
0.03
- (d)
0.04
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
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
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
A pressure cooker reduces cooking time because
- (a)
the heat is more evenly distributed
- (b)
a longer flame is used
- (c)
the high pressure tenderises the food
- (d)
b.p of water inside the cooker is increased
Match the following and choose the correct option.
Column I | Column II | ||
A. | Molarity | p. | mol/kg |
B. | Normality | q. | mol/L |
C. | Molality | r. | gram equivalent/L |
D. | NaCl | s. | i=2 |
- (a)
A B C D q r p s - (b)
A B C D p q s r - (c)
A B C D r q s p - (d)
A B C D s p q r
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
Normality of 2 M H2SO4 is
- (a)
4N
- (b)
6N
- (c)
\(\frac { N }{ 4 } \)
- (d)
\(\frac { N }{ 6 } \)
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
Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixture will show a positive deviation from Raoult's law?
- (a)
Methanol and acetone
- (b)
Chloroform and acetone
- (c)
Nitric acid and water
- (d)
Phenol and aniline
In comparison to 0.01 M solution of glucose, the depression in freezing point of 0.01 M MgCl2 is ......
- (a)
the same
- (b)
about twice
- (c)
about three times
- (d)
about six times
The value of van't Hoff factors for KCl, NaCl and K2SO4 , respectively, are
- (a)
2,2 and 2
- (b)
2,2 and 3
- (c)
1,1 and 2
- (d)
1,1 and 1
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to
- (a)
low temperature
- (b)
low atmospheric pressure
- (c)
high atmospheric pressure
- (d)
both low temperature and high atmospheric pressure
How much C2H5OH must be added to 1.0 L of H2O so that solution should not freeze at -4o F? [Kf (C2H5OH) =1.86o C/m]
- (a)
<10.75 g
- (b)
> 495.5 g
- (c)
<20 g
- (d)
494.5 g
On the basis of information given below, mark the correct option. Information On adding acetone to methanol, some of the hydrogen bonds between methanol molecules break.
- (a)
A specific composition of methanol- acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult's law
- (b)
A specific composition of methanol- acetone mixture forms maximum boiling azeotrope and will show positive deviation from Raoult's law
- (c)
A specific composition of methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult's law
- (d)
A specific composition of methanol- acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult's law
If two liquids A and B form minimum boiling azeotrope at same specific composition, then
- (a)
A -- B interactions are stronger than those between A -- A or B -- B
- (b)
vapour pressure of solution increases because more umber of molecules of liquids A and B can escape from the solution.
- (c)
Vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution.
- (d)
A -- B interactions are weaker than those between A -- A or B -- B
Relative lowering of vapour pressure is a colligative property because
- (a)
it depends on the concentration of an electrolyte or non - electrolyte solute in solution and does not depend on the nature of the solute molecules.
- (b)
it depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles
- (c)
it depends on the concentration of a non- electrolyte solute in solution as well as on the nature of the solute molecules
- (d)
it depends on the concentration of an electrolyte or non - electrolyte solute in solution as well as on the nature of solute molecules.
A 5.2 molal aqueous solution of methyl alcohol, CH3OH, is supplied. What is the mole fraction of methyl alcohol in the solution?
- (a)
0.100
- (b)
0.190
- (c)
0.086
- (d)
0.050
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at water to prevent it from freezing at -6o C will be (Kf for water = 1.86 K kg mol-1 and molar mass of ethylene glycol = 62 mol-1)
- (a)
800.00 g
- (b)
204.30 g
- (c)
400.00 g
- (d)
304.60 g
On mixing heptane and octane form an ideal solution, at 373 K, the vapour pressures of the two liquid components (heptane and octane) are 105 kPa and 45 kPa, respectively. Vapour pressure of the solution obtained by mixing 25 g of heptane and 35 g of octane will be (molar mass of heptane = 100 g mol-1 and that of octane = 114 g mol-1)
- (a)
72.0 kPa
- (b)
36.1 kPa
- (c)
96.2 kPa
- (d)
144.5 kPa
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