The ratio of lowering of vapour pressure of 0.1M aqueous solutions of KCl, CuSO4 and Na2SO4 is

  1. A

    1: 2:3

  2. B

    2: 2:3

  3. C

    1:1:1

  4. D

    3: 2:1

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    Solution:

    0.1M KC  0.2 moles of ion KClK++Cl-

    0.1M CuSO40.2 moles ofion CuSO4Cu2++SO42-0.1M0.3molesofion Na2SO42Na++SO42-Ratio of lowering of vapour pressure depends upon no. of moles of ions.

    =0.2:0.2:0.3

    2:2:3

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