Q. 75.0( 1 Vote )

Give reasons:

Answer :

(a) In ethanol, molecules are associated through intermolecular H-bonding. On adding acetone it enters between the host molecules and breaks some of the H-bonds resulting in positive deviation from Raoult’s law. This reaction is endothermic (ΔHmix = positive) in nature and thus a decrease in temperature is observed.

(b) Potassium chloride solution freezes at a lower temperature than water because when a non volatile solute like KCl is added to water, it will result into lowering of vapour pressure of solution than that of pure solvent. Now the solution will freeze at a temperature lower than the freezing point of pure solvent and this is called depression in freezing point.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

State Henry’s LawChemistry - Board Papers

Using Raoult’s laChemistry - Exemplar

Note: In the follChemistry - Exemplar

When 1 mol of NaCChemistry - Exemplar

Components of a bChemistry - Exemplar