Question

The particle size in a suspension is:

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

Hint:

Suspensions contain larger particles, often visible, that settle out over time.

Answer 1

The Correct Option is C

In the field of Chemistry, suspensions are a type of heterogeneous mixture where particles are dispersed throughout a fluid. The defining characteristic of a suspension is the size of the dispersed particles.

For suspensions, the particles are relatively large, typically greater than 2000 Å (angstroms). This large size allows the particles in a suspension to settle out over time under the influence of gravity, which is not the case with smaller particles in solutions or colloids.

Let's review the options:

• 1 Å – 10 Å: This range falls within the size category of particles in a solution, not a suspension.
• 10 Å – 2000 Å: This size range is characteristic of colloidal particles.
• More than 2000 Å: This fits the size of particles found in a suspension, as particles larger than this size tend to settle out.
• Less than 1 Å: Such small particles typically refer to molecular dimensions seen in true solutions.

Therefore, the correct answer is that in a suspension, the particle size is more than 2000 Å.

Answer 2

The question asks which particle-size range describes a suspension. Check each range against how particles of that size actually behave in a liquid.

1. 1 Å - 10 Å: particles this small never settle and pass through every filter, including a membrane filter. That is a true solution's behavior, not a suspension's.
2. 10 Å - 2000 Å: particles here stay suspended indefinitely and scatter light without settling. That is how a colloid behaves.
3. More than 2000 Å: particles this large are heavy enough for gravity to pull them down over time, and they get caught by ordinary filter paper. This is exactly how a suspension behaves.
4. Less than 1 Å: no dispersed particle is this small; it is smaller than even a true solution's solute particles.

Only particles bigger than 2000 Å settle out and get caught by plain filter paper, which is the defining behavior of a suspension.

So the correct answer is more than 2000 Å.