Question

The particle size in a colloidal solution is:

• A. 1 Å – 10 Å
• B. 10 Å – 2000 Å
• C. More than 2000 Å
• D. Less than 1 Å

Hint:

Colloidal solutions have particle sizes in the range of 10 Å to 2000 Å, which is why they exhibit the Tyndall effect.

Answer 1

The Correct Option is B

To determine the characteristic particle size range for colloidal solutions, we need to understand the nature of colloids in chemistry. A colloidal solution, which is a type of heterogeneous mixture, consists of particles that are dispersed throughout the solution but do not settle out due to gravity like those in suspensions.

The key factor distinguishing colloids from other types of mixtures, such as solutions and suspensions, is the size of its dispersed particles:

• True solutions: Particle size < 1 Å
• Colloidal solutions: Particle size between 10 Å and 2000 Å
• Suspensions: Particle size > 2000 Å

This information helps us identify the correct option for the particle size range of colloidal solutions from the given options:

• 1 Å – 10 Å (True solution)
• 10 Å – 2000 Å (Correct for colloids)
• More than 2000 Å (Suspension)
• Less than 1 Å (True solution)

Therefore, the particle size in a colloidal solution is 10 Å – 2000 Å.