The substances which behave as colloidal solutions at higher concentration are called:

associated colloids

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multimolecular colloids

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macromolecular colloids

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protective colloids

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Solution

The correct option is A associated colloids
Associated colloids are substances which at low concentrations behave as normal strong electrolytes, but at higher concentrations exhibit colloidal behaviour due to the formation of aggregates.
The aggregated particles formed are called micelles.
The formation of micelles takes place only above a particular temperature called Kraft temperature and above a particular concentration called critical micelle concentration.
Soaps and synthetic detergents belongs to the class of associated colloids.

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