Whether it can be separated into simpler substances via physical separation procedures. Hence, option D is correct.
A mixture is composed of one or more pure substances in varying compositions.
A mixture, which is not uniform in composition is known as a heterogeneous mixture.
Examples of heterogeneous mixtures are colloids and suspension.
In suspensions, the components get distinguished itself through simple physical separation techniques, while in colloids the constituents do not get distinguished as the colloids prevail in liquid, solid, or gaseous states.
If a suspension is permitted to stand the particles will get distinguished.
A colloid is an intermediate between a suspension and a solution.
A suspension will separate out, however, a colloid will not.
Hence, option D is correct.
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