2. Explain why on addition of 1 mol of NaCl to 1 litre of water, the boiling point of water increases, while addition of 1 mol of methyl alcohol to one litre of water decreases its boiling point.
NaCl is non-volatile solute. So, its addition to water lowers the vapour pressure of the water. Hence, boilling poitn of water ( solution) increases.
