JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sc218
Select the correct statement(s) about gels.
AThe exudation of liquid from a gel on standing is called syneresis.
BThe swelling of a dry gel on absorbing a liquid is called imbibition.
CA thixotropic gel liquefies on shaking and sets again on standing.
DGel-forming substances such as gelatin and agar are lyophobic colloids.
Answer: A, B, C
Syneresis, imbibition and thixotropy are correctly defined in statements 1 to 3. Gelatin and agar are lyophilic colloids, which is why they take up water and swell, so statement 4 is wrong.