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WB JEE Medical WB JEE Medical Solved Paper-2006

  • question_answer
    The vapour pressure will be lowest for :

    A)  0.1 M sugar solution

    B)  0.1 M KC1 solution

    C)  \[0.1\text{ }MCu{{(N{{O}_{3}})}_{2}}\] solution

    D)  \[~0.1\text{ }M\text{ }AgN{{O}_{3}}\] solution

    Correct Answer: C

    Solution :

                     Vapour pressure of a solvent is lowered by the presence of solute in it. Lowering in vapour pressure is a colligative property i.e., it depends on the number of particles present in the solution. \[Cu{{(N{{O}_{3}})}_{2}}\] give the maximum number of ions (i.e., 3) so it causes the  greatest lowering in vapour pressure of water.


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