Q.

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

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a

none of these

b

rate of evaporation of solvent is reduced

c

solute does not affect the rate of condensation

d

vapour pressure of the solution becomes lower than the vapour pressure of the pure solvent

answer is A.

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Detailed Solution

  • If we add a non volatile solute to solvent such as water, we decease the tendency for water molecules to evaporate into the gas phase.
  • in essence, the solute particles obstruct the evaporation of water, as a result, fewer molecules change from the liquid to the gas phase, thus reducing the vapor pressure.
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When non-volatile solute is added to a pure solvent, the