Test: Colligative Properties - JEE MCQ

# Test: Colligative Properties - JEE MCQ

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## 15 Questions MCQ Test - Test: Colligative Properties

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Test: Colligative Properties - Question 1

### Which one of the following is not a colligative property?

Detailed Solution for Test: Colligative Properties - Question 1

Depression in freezing point is a colligative property but freezing point is not a colligative property.

Test: Colligative Properties - Question 2

### The molal elevation constant is the elevation in boiling point of

Detailed Solution for Test: Colligative Properties - Question 2

The correct answer is Option B.

Molal elevation constant is a characteristic constant for a given solvent. It is the elevation of boiling point produced when one mole of solute is dissolved in 1 kg of solvent. The proportionality constant, Kb, is called the molal boiling point elevation constant. It is a constant that is equal to the change in the boiling point for a 1-molal solution of a nonvolatile molecular solute.

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Test: Colligative Properties - Question 3

### The colligative properties of a solution are

Detailed Solution for Test: Colligative Properties - Question 3

The correct answer is option A
The colligative properties of a solution are
Proportional to the number of solute particles present.
In chemistry, colligative properties are those properties of solutions that depend on the ratio of the number of solute particles to the number of solvent molecules in a solution, and not on the nature of the chemical species present.

Test: Colligative Properties - Question 4

The information that is/are needed to determine the molar mass of an unknown solute is/are

Detailed Solution for Test: Colligative Properties - Question 4

Elevation of boiling point and depression in freezing point are directly related to molality of solution.

Test: Colligative Properties - Question 5

What is the boiling point of a 3 molal aqueous solution if Kb is 0.512°C/m?

Detailed Solution for Test: Colligative Properties - Question 5

Test: Colligative Properties - Question 6

Which of the following is a colligative property?

Detailed Solution for Test: Colligative Properties - Question 6

Colligative properties- The properties that depend upon the ratio of the number of solute molecules and total molecules not upon the nature of solute molecules named as colligative properties.

Example- Osmotic pressure, elevation of boiling point, depression in freezing point and relative lowering of vapour pressure.

Test: Colligative Properties - Question 7

Beckmann thermometers are used to measure

Detailed Solution for Test: Colligative Properties - Question 7

The correct answer is Option B.
A Beckmann's thermometer is a device used to measure elevation in boiling point or depression in freezing point.

Test: Colligative Properties - Question 8

A solution was made by dissolving 2 g of a solute in 100 g of acetone. The solution boiled at 56.95° C. The boiling point of pure acetone is 55.95° C, and the Kb =1.71°C/m. What is the molecular weight of the solute?

Detailed Solution for Test: Colligative Properties - Question 8

The correct answer is Option B.

∆Tb =(Kb × 1000 × W2) / M2 × W1
⇒ M2 = (Kb × 1000 × W2) / ∆Tb × W1
= (1.71 × 1000 × 2) / 1 × 100
= 34.2g

Test: Colligative Properties - Question 9

The molal elevation constant is the ratio of the elevation in B.P to:

Detailed Solution for Test: Colligative Properties - Question 9

The correct answer is option A
Due to solute presence in the solution, the solution's boiling point is greater than the pure solvent's boiling point. This is called as elevation in boiling point and it can be represented as:
ΔTb​=Kb​ × molality

Test: Colligative Properties - Question 10

Which of the two has lower freezing point, 2m NaCl or 5m NaCl aqueous solution?

Detailed Solution for Test: Colligative Properties - Question 10

The correct answer is option C
ΔTf= Kf  x m Since ΔTf for 5m NaCl will be higher than for 2m, 5m NaCl solution freezes at a lower temperature.

Test: Colligative Properties - Question 11

If the vapour pressure of pure solvent A is 17.5 mm and lowering of vapour pressure of solution formed by adding a non-volatile electrolyte is 0.0175 mm then what is the relative lowering of vapour pressure?

Detailed Solution for Test: Colligative Properties - Question 11

The correct answer is option C
Relative lowering of vapour pressure:
= lowering of vapour pressure of solution/ vapour pressure of pure solvent
=0.0175/17.5=0.001

Test: Colligative Properties - Question 12

Which of the following unit of concentration is independent of temperature?

Detailed Solution for Test: Colligative Properties - Question 12

Molality (amount of moles per 1 kg of the solvent, mol/kg) and mole fraction (mol/mol) will remain constant since they are independent of volume of the solution which changes with temperature. Molarity i.e. amount of moles of a substance in 1 liter of a solution will change with volume of the solution so it will change with temperature.

Test: Colligative Properties - Question 13

Relative lowering of vapour pressure is directly proportional to

Detailed Solution for Test: Colligative Properties - Question 13

Relative lowering of vapour pressure is directly proportional to mole fraction of solute. Hence it is a colligative property.

Test: Colligative Properties - Question 14

When common salt is dissolved in water:

Detailed Solution for Test: Colligative Properties - Question 14

The correct answer is Option B.

When a non-volatile solute is dissolved in a pure solvent, its vapour pressure is decreased. The difference in the boiling points of the solution and pure solvent is called elevation in boiling point.

The elevation in the boiling point of a solution of nonelectrolyte is proportional to its molality and the equimolal solution of all the substances in the same solvent will show an equal elevation in boiling points. These are known as Raoult's laws of elevation of the boiling point.

So, the addition of salt will increase the boiling point of the solution.

Test: Colligative Properties - Question 15

Camphor is used as solvent to determine the molecular mass of non-volatile solute by Rast method because for camphor

Detailed Solution for Test: Colligative Properties - Question 15

The correct answer is “molal depression constant is high”.

Camphor is used for the determination of molecular masses of solute by Rast method because its molal depression constant is very high 40Kmolality-1 .

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