Select the correct classifications of the colloids.

AGold sol: multimolecular colloid
B $As X_{2} S X_{3}$ sol: macromolecular and lyophilic colloid
CStarch in water: macromolecular and lyophilic colloid
DSodium stearate solution well below its CMC: associated colloid

Answer: A, C

A gold sol consists of aggregates of many atoms, so it is multimolecular, and starch consists of giant molecules that are solvated, so it is macromolecular and lyophilic. The

As X_{2} S X_{3}

sol is an aggregate of small units and is lyophobic, not macromolecular. Below the CMC soap is present as single ions, not as an associated colloid.

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