A lyophilic colloid that is added to a lyophobic sol to prevent its coagulation by electrolytes is called a:

Apeptizing agent
Bprotective colloid
Cdispersed phase
Demulsifier

Answer: B

Lyophilic colloid particles (such as gelatin) form a solvated layer around the lyophobic particles and shield them from the electrolyte. Such a substance is called a protective colloid.

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