Question

When a non volatile solute is added to a pure solvent, the :

• A. vapour pressure of the solution becomes lower then that of the pure solvent
• B. rate of evaporation of the pure solvent is reduced
• C. solute does not effect the rate of condensation
• D. rate of the evaporation of the solution is equal to the rate of condensation of the solution at a lower vapour pressure than that in the case of the pure solvent

Answer 1

The correct option is A vapour pressure of the solution becomes lower then that of the pure solvent

If we add a non volatile solute to solvent such

as water, we decease the tendency for water

molecules to evaporate into the gase phase.

in essence, the solute particles obstract the

evaporation of water, as a result, fcream

molecules change from the liquid to the gas

phase, thus reducing the vapour pressure.

$henceAns-{}^{\prime }{A}^{\prime }$