JEE Advanced levelSingle correct optionDifficulty 3 of 3sc211
Which statement about a gelatin gel is INCORRECT?
AA hot concentrated aqueous gelatin sol sets to a gel on cooling
BWarming the gel regenerates the sol
CGelatin gels are elastic
DGelatin is a lyophobic colloid, so its gel cannot be turned back into a sol on heating
Answer: D
Gelatin is a lyophilic (reversible) colloid. Its hot sol sets to an elastic gel on cooling, and warming the gel regenerates the sol. The statement calling it lyophobic and irreversible is therefore wrong.