Question

which of these mixtures has the smallest particles?
a colloid
b compound
c solution
d suspension

Explanation:

To determine which mixture has the smallest particles, we analyze each option:

• Option a (colloid): Colloid particles range from 1 - 1000 nm.
• Option b (compound): A compound is a pure substance (not a mixture), so it is irrelevant here.
• Option c (solution): Solution particles (solute) are typically less than 1 nm (molecules, ions), the smallest among mixtures.
• Option d (suspension): Suspension particles are larger (usually > 1000 nm) and settle over time.

Since the question asks about mixtures, we exclude compounds. Among colloids, solutions, and suspensions, solutions have the smallest particles.

Answer:

c. solution