Question

Which criteria determine whether a heterogeneous mixture is a colloid or a suspension?

a) whether its composition is uniform and transparent

b) whether the particles do not settle for an extended period of time

c) whether the ratio of components is fixed

d) whether it can be separated into simpler substances through physical separation techniques

Answer 1

The correct answer is B. whether the particles do not settle for an extended period of time

Uniformity and transparency are not affected by these, which also applies to ratio fixedness.

Answer 2

Correct Answer: Option B: whether the particles do not settle for an extended period of time

Reason:
Particle size in colloidal solution ranges from 1-100 nm, while that is suspension is more than 100 nm. Due to large particle size, particles in suspension settle down, upon standing for long. Thus, the best criteria determine whether a heterogeneous mixture is a colloid or a suspension is to check whether the particles do not settle for an extended period of time