Question 53
Assertion (A) When NaCl is added to water a depression in freezing point is observed.
Reason (R) The Lowering of vapour pressure of a solution causes depression in the freezing point.
(a) Assertion and reason both are correct and reason is correct explanation of assertion. When NaCl is added to water a depression in freezing point is observed. This is due to lowering of vapour pressure of a solution. Lowering of vapour pressure is observed due to intermolecular interaction of solvent-solute particles.