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

Picture muddy water left standing in a glass. Within a few minutes the mud settles to the bottom, leaving clearer water on top. That settling is the signature of a suspension, so use it to test each option.

1. 1 Å - 10 Å: particles this size behave like the dissolved salt in salt water. They never settle, no matter how long the glass stands, so this is a true solution's range.
2. 10 Å - 2000 Å: particles this size behave like the fat and protein in milk. They stay evenly spread out and do not separate on standing, so this is a colloid's range.
3. More than 2000 Å: particles this size behave like the mud in the glass of muddy water. They are heavy enough to sink, matching a suspension exactly.
4. Less than 1 Å: this is smaller than any real dispersed particle and does not match any of the three mixtures above.

Since a suspension is the mixture that settles like the mud in water, its particle size has to be more than 2000 Å.

Answer 2

Rank the three mixture types by particle size, from smallest to largest: true solution, colloid, suspension. A suspension sits at the top end of that scale.

1. 1 Å - 10 Å: this is the lowest band, matching a true solution, not the top of the scale.
2. 10 Å - 2000 Å: this is the middle band, matching a colloid.
3. More than 2000 Å: this is the highest band on the scale, past both the true-solution and colloid ranges, which is exactly where a suspension's particles sit.
4. Less than 1 Å: this falls below the lowest band and matches no real mixture.

Since a suspension occupies the topmost band on the particle-size scale, the correct answer is more than 2000 Å.