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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    At certain temperature, a 5.12% solution of cane sugar is isotonic with a 0.9% solution of an unknown solute. The molar mass of solute is

    A)  60                                         

    B)  46.17

    C)  120                                       

    D)  90

    E)  92.34

    Correct Answer: A

    Solution :

                    Solutions having same osmotic pressure are called isotonic solutions. The osmotic pressure is given as \[\because \]     \[\pi =\frac{{{w}_{B}}RT}{V{{M}_{B}}}\] \[\pi \](cane sugar) \[=\pi \](unknown solute) \[\frac{5.12}{342}=\frac{0.9}{M}\] \[M=\frac{342\times 0.9}{5.12}\] \[=60\]


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