Question

9 which of the following best describes a colloid? a particles settle over time b transparent solution c uniform mixture with small particles d tiny particles that scatter light but dont settle

Explanation:

Colloids have tiny particles that exhibit the Tyndall effect (scatter light) and remain suspended without settling out due to Brownian motion and electrostatic repulsion. Option A is incorrect as colloid particles don't settle easily. Option B is wrong as colloids aren't always transparent solutions. Option C is too general; a uniform mixture with small - particles could refer to solutions too. Option D correctly describes the key characteristics of colloids.

Answer:

D. Tiny particles that scatter light but don't settle