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Which of the following is an example of an intrinsic colloid?

1. Glue
2. Sulphur
3. Iron
4. As2S3

Correct answer: Glue

Solution

Intrinsic colloids are lyophilic substances that form colloids spontaneously, such as glue, starch, and gelatin. As2S3, sulphur, and metals like iron are extrinsic (lyophobic) colloids. The example of an intrinsic colloid is glue.

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