Paper: CSIR-NET December 2013 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Laws State Functions · Marks: 2 · Difficulty: Medium
The boiling point of a solution of non-volatile solid is higher than that of the pure solvent. It always indicates that
(a)the enthalpy of the solution is higher than that of the pure solvent
(b)the entropy of the solution is higher than that of the pure solvent
(c)the Gibbs free energy of the solution is higher than that of the pure solvent
(d)the internal energy of the solution is higher than that of the pure solvent
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The elevation arises because dissolving the solute raises the entropy of the liquid phase, lowering its chemical potential and requiring a higher temperature to match the vapour.