Question

Assertion (A) : In a colloid, the size of solute particles is bigger than the particles of true solution

but smaller than those of suspension.

Reason (R) : Sand with particle size between 10" to 10 m dissolves in water to form colloidal

solution that shows Tyndall effect.​

Answer 1

A) both A & R are true and R is correct explation of A

Explanation:

Just i think this is correct answer

Answer 2

The Assertion(A) is correct, but the Reason(R) is not correct.

Assertion (A): In a colloid, the size of solute particles is bigger than the particles of a true solution but smaller than those of suspension.

• This statement is correct.
• The types of solution are classified based on the size of their constituent particles as:

1. True solutions: Their particles are less than 0.001 micrometers in size and cannot be seen by the naked eye. Example: salt in water
2. Colloids: Particle size ranges from 1 to 1000 nanometers, but cannot be seen by the naked eye.Example: milk, gelatin, butter, etc.
3. Suspensions: Particle size is greater than 1000 nanometers and the particles are large enough to be visualized by the naked eye. Example: sand in water.

• Therefore, from their definitions, we can see that colloid particle size is intermediate between that of true solutions and suspensions.
• So the Assertion is correct.

Reason (R): Sand with particle size between 10" to 10 m dissolves in water to form a colloidal solution that shows the Tyndall effect.​

• This statement is incorrect.

What is the Tyndall Effect?

• The particles of colloidal solution are large enough to scatter light.
• So when light is passed through a colloidal solution, its path becomes visible due to scattering by the particles.
• This phenomenon is called Tyndall Effect.

• Thus, since sand in water is a suspension, it does not show Tyndall Effect because the particles of sand are dense, hence they settle at the bottom.

• Therefore, the Reason is incorrect.

Hence, the Assertion (A) is correct but the Reason(R) is incorrect.