Question

Explain how boiling point gets affected by the presence of non-volatile solute and external pressure. (HOTS)

Answer 1

Presence of non-volatile solute affects the vapour pressure of the solvent by replacing the solvent molecules to solute molecules.
This decreases the vapour pressure of the solvent which decreases the boiling point of solvent. Also, applying external pressure decreases the vapour pressure of solvent which decreases the boiling point of solvent molecules.