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

Two beakers of capacity 500 mL were taken. One of these beakers, labeled as “A”, was filled with 400 mL water whereas the beaker labelled “B” 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 Fig. 2.2. 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 _______________.

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.

KH value for Ar(g), CO₂(g), HCHO (g) and CH₄(g) are 40.39, 1.67, 1.83×10^–5 and 0.413 respectively.

Arrange these gases in the order of their increasing solubility.