Two beakers of capacity 500 mL were taken. One of these beakers, labelled as " $A$ ", was filled with 400 mL water whereas the beaker labelled " $B^{\prime}$ was filled with 400 mL of 2 M solution of NaCl . At the same temperature both the beakers were placed in closed containers of same material and same capacity as shown in figure.

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution?

If two liquids $A$ and $B$ form minimum boiling azeotrope at some specific composition then

4 L of 0.02 M aqueous solution of NaCl was diluted by adding 1 L of water. The molality of the resultant solution is ........... .

On the basis of information given below mark the correct option. Information On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

$\mathrm{K}_{\mathrm{H}}$ value for $\mathrm{Ar}(\mathrm{g}), \mathrm{CO}_2(\mathrm{~g}), \mathrm{HCHO}(\mathrm{g})$ and $\mathrm{CH}_4(\mathrm{~g})$ are 40.39, 1.67, $1.83 \times 10^{-5}$ and 0.413 respectively.

Arrange these gases in the order of their increasing solubility.