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BVP Medical BVP Medical Solved Paper-2005

  • question_answer
    20g of a binary electrolyte (mol. wt     =100) are dissolved in 500 g of water.   The depression in freezing point of the     solution is \[{{0.74}^{o}}C\](\[{{K}_{f}}=1.86\text{ }K\] \[molalit{{y}^{-1}}\])    The degree of ionization of the electrolyte is:                           

    A)  \[0%\]                                 

    B)  \[100%\]             

    C)  \[75%\]                              

    D)  \[50%\]             

    Correct Answer: A

    Solution :

                    \[\Delta T=\frac{1000\times 1.86\times 20}{m\times 500}\] \[0.74=\frac{1000\times 1.86\times 20}{m\times 500}\] \[m=100\] Actual molecular mass = 100       \[\therefore \]The degree of ionization of the electrolyte is 0%.               


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