Solutions Test

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Solutions Test - 1

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Question 1
1 / -0

A 0.100 m solution of NaClO₃ freezes at – 0.343^oC. At 0.001 m concentration of the same salt, the electrical interferences between the ions no longer exist, because on an average, the ions are too far from each other.

The degree of dissociation of a 0.100 m NaCl solution is

A
42.5%

B
28.3%

C
85%

D
80%
Question 2
1 / -0

Raoult’s law states that for a solution of volatile liquids the partial pressure of each component in the solution is

A
Directly proportional to the temperature

B
Directly proportional to the volume

C
Inversely proportional to the mole fraction

D
Directly proportional to the mole fraction

Solution

Raoult’s law states that for a solution of volatile liquids the partial pressure of each component in the solution is directly proportional to mole fraction of component.
Question 3
1 / -0

The molality of a solute in a solution is the

A
amount of solvent per dm³ of the solution

B
amount of solute per dm³ of the solution

C
amount of solvent per kg of the solution

D
amount of solute per kg of solvent
Question 4
1 / -0

Molality of a solution relates the

A
Volume of solution and moles of solute

B
Volume of solute and volume of solvent

C
Moles of solution and mass of solution

D
Moles of solute and mass of solvent

Solution

Molality is number of moles of solute dissolved in per Kg of solvent.
Question 5
1 / -0

A solution of sucrose in 100 g of water boils at 100.25°C. If this solution is boiled till its temperature becomes 101°C, the mass of water evaporated from the solution is

A
25 g

B
50 g

C
75 g

D
85 g
Question 6
1 / -0

Example of solution of liquid in gas is

A
alcohol in water

B
dry air

C
moist air

D
mercury in gold

Solution

Solute is water (liquid) and solvent is gas( air).
Question 7
1 / -0

Which of the following is true?

A
The ideal behaviour of a liquid solution is due to the fact that the different molecules present in it do not interact with one another.

B
The ideal behaviour of a liquid solution is due to the fact that the different molecules present in it do not interact with one another.

C
The constituents of an ideal solution follow Raoult`s law under all conditions.

D
The addition of a non-volatile solute to a volatile solvent decreases the boiling point of the latter.
Question 8
1 / -0

Which of the following is true?

A
Molarity of a solution is independent of temperature.

B
Molality of a solution is independent of temperature.

C
Mole fraction of a solute in a solution is dependent on temperature.

D
The unit of molality is mol dm^-3.
Question 9
1 / -0

An aqueous solution of an ionic salt having molality equal to 0.1892 freezes at – 0.704^oC. What is the van't Hoff factor of the salt? (Given Kf for water = 1.86 K/m)

A
2

B
3

C
4

D
5
Question 10
1 / -0

Which of the following is not a colligative property?

A
Osmotic pressure

B
Depression in freezing point

C
Vapour pressure

D
Elevation in boiling point

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Solutions Test - 1

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Question 1

42.5%

28.3%

85%

80%

Question 2

Directly proportional to the temperature

Directly proportional to the volume

Inversely proportional to the mole fraction

Directly proportional to the mole fraction

Solution

Question 3

amount of solvent per dm3 of the solution

amount of solute per dm3 of the solution

amount of solvent per kg of the solution

amount of solute per kg of solvent

Question 4

Volume of solution and moles of solute

Volume of solute and volume of solvent

Moles of solution and mass of solution

Moles of solute and mass of solvent

Solution

Question 5

25 g

50 g

75 g

85 g

Question 6

alcohol in water

dry air

moist air

mercury in gold

Solution

Question 7

The ideal behaviour of a liquid solution is due to the fact that the different molecules present in it do not interact with one another.

The ideal behaviour of a liquid solution is due to the fact that the different molecules present in it do not interact with one another.

The constituents of an ideal solution follow Raoult`s law under all conditions.

The addition of a non-volatile solute to a volatile solvent decreases the boiling point of the latter.

Question 8

Molarity of a solution is independent of temperature.

Molality of a solution is independent of temperature.

Mole fraction of a solute in a solution is dependent on temperature.

The unit of molality is mol dm-3.

Question 9

2

3

4

5

Question 10

Osmotic pressure

Depression in freezing point

Vapour pressure

Elevation in boiling point

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amount of solvent per dm³ of the solution

amount of solute per dm³ of the solution

The unit of molality is mol dm^-3.