Addition of non-volatile solute to a solvent always inceases the colligative properties such as osmotic pressure, `DeltaP, DeltaT_(b)` and `DeltaT_(f)`. All these colligative properties are direactly propertional to molality if solutions are dilute. The increase in colligative properties on addition of non-volatile solute is due to incease in number of solute particles.
For different aqueous solutions of `0.1 N NaCl, 0.1 N` urea, `0.1 N Na_(2)SO_(4)` and `0.1 N Na_(3)PO_(4)` solution at `27^(@)C`, the correct statement are :
(P) The order of osmotic pressure is, `NaCl gt Na_(2)SO_(4) gt Na_(3)PO_(4) gt ` urea
(Q) `pi = (DeltaT_(b))/(K_(b)) xx ST` for urea solution
(R) Addition of salt on ice increases its melting point
(S) Addition of salt on ice brings in melting earlier

Options

A. Q, R, S
B. P, Q, S
C. P, Q, R
D. R, S

Answer

B