Statement 1: When NaCl is added to water, a depression in free zing point is observed.Statement 2: The lowering of vapour pressure of a solution causes depression in the freezing point.

When NaCl is added to water, a depression in freezing point is observed. This is due to lowering of vapour pressure of the solution. Lowering of vapour pressure is observed because some surface is occupied by solute (non-volatile) molecules.