Give an example of protective colloid.

Dear student!
The protective colloid is a type of lyophilic  (water loving) colloid which is used to protect the lyophobic colloids from precipitating in an electrolytic solution.  
The common example of protective colloids are : gelatin, casein, hemoglobin,  egg albumin etc.

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Calcium phosphate of blood plasma is held in colloidal suspension by protective action of plasma protein.

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