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VMMC VMMC Medical Solved Paper-2003

  • question_answer
    The molecular, mass of \[\text{NaCl}\] as determined by osmotic pressure measurement is:

    A)  58.5          

    B)                        less than 58.5

    C)         more than 58.5

    D)         unpredicitable

    Correct Answer: B

    Solution :

    \[\text{NaCl}\] is an ionic compound. It dissociates into ions in solution. As the osmotic pressure is a colligative property, hence observed osmotic pressure is always greater than the expected. Therefore, molecular weight is always obtained less than 58.5 (mol. wt. of\[\text{NaCl}\]), as: \[PV=\frac{W}{M}.ST\]


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