Question

Which of the following can not be used as a protective colloid?​

Answer 1

Answer:

the correct answer is gelatin

Explanation:

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Answer 2

Answer:

The correct answer is gold sol.

Explanation:

Protective colloids are lyophilic, which are more stable than lyophobic. So, protective colloids protect lyophobic colloids from getting precipitating as lyophilic colloids create a layer around lyophobic colloids.

Since, gelatin, starch and gum are lyophilic in nature and gold sol is lyophobic.

Therefore, gold sol can not be used as a protective colloid.