The following graph is obtained for vapour pressure (in atm) (on $Y$-axis) and $T$ (in K) (on $X$-axis) for aqueous urea solution and water. What is the boiling point (in K) of urea solution?

(Atmospheric pressure $=1 \mathrm{~atm}$ )

Given below are two statements.

Statement I : Liquids $A$ and $B$ form a non-ideal solution with negative deviation. The interactions between $A$ and $B$ are weaker than $A-A$ and $B-B$ interactions.

Statement II : In reverse osmosis, the applied pressure must be higher than the osmotic pressure of solution

The correct answer is

A non- volatile solute is dissolved in water. The $\Delta T_{\mathrm{b}}$ of resultant solution is 0.052 K . What is the freezing point of the solution ( in K )?

( $K_b$ of water $=0.52 \mathrm{~K} \mathrm{kgmol}^{-1}$,

$K_f$ of water $=1.86 \mathrm{~K} \mathrm{kgmol}^{-1}$,

freezing point of water $=273 \mathrm{~K}$ )