9.1.6 Solution, Colloidal Solution and Suspension

This is the sixth lecture from Chapter 1: ‘States of Matter and Phase Changes’ of the new book for 9th Class Chemistry (Punjab Board – PCTB). It discusses the three common types of mixtures, solutions, colloidal solutions and suspensions. The lecture includes a multiple-choice quiz, short-answer questions, and detailed long-answer notes.

MCQs Based Quiz

1 / 10

1. If kept for some time, solute particles in a colloid would:

Clump together

Dissolve into the solvent

Settle down

Remain dispersed

2 / 10

2. Which of the following mixture leaves residue on the filter paper?

Solution

Suspension

Colloid

True solution

3 / 10

3. If you filter a mixture and no residue remains on the filter paper, the mixture could be:

Solution

Suspension

Colloid

Solution or colloid

4 / 10

4. A mixture in which solute particles can only be seen with the help of a microscope is called:

Solution

Suspension

Colloid

True solution

5 / 10

5. A mixture with very small undissolved particles is called:

Solution

Suspension

Colloid

True solution

6 / 10

6. What is the identification of suspensions?

Separation of solute and solvent after some time

Passing through a filter paper

Small size of solute particles

All of these

7 / 10

7. A mixture in which solute particles can be seen with the naked eyes is called:

True Solution

Solution

Colloid

Suspension

8 / 10

8. Which of the following mixtures will not pass through a filter paper?

Mixture of water and sugar

Mixture of Chalk Powder and water

Mixture of NaCl and Water

Milk

9 / 10

9. A mixture with a uniform composition is called:

Solution

Colloid

Suspension

Allotrope

10 / 10

10. Which of the following mixtures is a true solution?

Mixture of Salt and Water

Mixture of Chalk in water

Mixture of Starch in Water

Mixture of Egg white and Water

Your score is

The average score is 100%

Short Questions

Q1. What is the definition of solutions?

A solution is mixture in which solute particles are completely dissolved in the solvent.
Example: Solution of sugar and water

Q2. How would you define suspension?

A suspension is a mixture in which solute particles do not dissolve in the solvent and if kept for some time they settle down.
Example: Chalk and water

Q3. What do you mean by a colloid?

A colloid is a mixture in which solute particles do not dissolve in the solvent but unlike suspension they do not settle down.
Example: Milk and Egg white

Q4. How would you differentiate between a true solution and a colloid.

A true solution and a colloid can be differentiated with the help of a microscope. If you see small undissolved particles in the mixture it will indicate a colloid. But if there are no undissolved solute particles then it will be called a solution.

Q5. Why do colloids look like solutions but actually are not.

Colloids looks like solutions due to following reasons:
1. When seen with naked eyes, it looks like solute particles are completely dissolved in the solvent.
2. If it is passed through a filter paper, it passes through without a residue.

Q6. Why do solute particles in suspension settle down after some time but colloids do not.

Suspension have very large undissolved solute particles which settle down after some time. On the other hand colloids have very small undissolved solute particles which can stay suspended in the solvent indefinitely.

Q7. What would happen if you filter a solution, a colloid and a suspension?

If a solution and a colloid is filtered, it would pass through the filter paper without leaving any residue. However, if a suspension is passed, it will leave a residue on the filter paper.

Descriptive Question

Q1. How would you differentiate solutions, colloids and suspensions.

Solutions

Colloids

Suspensions

Solutions are mixtures in which solute particles are completely dissolved in the solvent.

Colloids are mixtures in which very small undissolved particles stay dispersed in the solvent.

Suspensions are mixtures in which large undissolved particles settle down in the solvent after some time.

Solute is present in the form of atoms, ions or molecules.

Solute is present in the form of very small undissolved particles.

Solute is present in the form of large undissolved particles.

Solute particles can never be seen.

Solute particles can be seen with the help of a microscope.

Solute particles can be seen with the naked eye.

Solute particles never settle down.

Solute particles settle down after some time.

It can be filtered without leaving any residue on the filter paper.

It can also be filtered without leaving any residue on the filter paper.

Suspensions leave a residue on the filter paper.

Examples: Lemonade, Air, Steel

Examples: Milk, Blood, Egg White

Examples: Chalk powder in water, Dust in air