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(a) Define vapour pressure (b) Expla...

(a) Define vapour pressure
(b) Explain why vapour pressure of a solvent lowered by the addition of non-volatile solute ?

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(a) Vapour Pressure . Vapour pressure of a liquid (or solution) is the pressure exerted by its vapours in equilibrium with the liquid (on solution) at a particular temperature .
(b) The presence of non volatile solute in a solution reduces the escaping tendency of the solvent molecules into vapour phase because some of solute particles occupy the position of solvent molecules on liquid surface . This lowers the vapour pressure .
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Knowledge Check

  • Freezing point of a solvent containing a non volatile solute

    A
    is depressed
    B
    is elevated
    C
    does not change
    D
    None of the above

  • The boiling point of a solvent containing non volatile solute :

    A
    is depressed
    B
    is elevated
    C
    does not change
    D
    None of the above

  • What happens to the vapour pressure of a liquid when a non-volatile solute is added to it

    A
    increases
    B
    decreases
    C
    remains same
    D
    first increases and then decreases

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    Why the vapour pressure of a solution decrease when non-volatile solute is added into it?

    Define Raoult's Law for non-volatile solute ?

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    The vapour pressure of a give liquid will decrease if :

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