JEE Main levelSingle correct optionDifficulty 2 of 3sc122
Assertion (A): Lyophilic sols are more stable than lyophobic sols. Reason (R): The particles of a lyophilic sol are extensively solvated by the dispersion medium. Choose the correct option.
ABoth A and R are true but R is not the correct explanation of A
BBoth A and R are true and R is the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: B
A lyophilic sol is stabilised by a layer of solvent around each particle, in addition to any charge. The solvation layer keeps the particles apart, so the sol resists coagulation. Hence both statements are true and R explains A.