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Manipal Engineering Manipal Engineering Solved Paper-2013

  • question_answer
    \[A\,\,0.15\]molal solution of\[{{K}_{4}}[Fe{{(CN)}_{6}}]\]in water freezes at\[-{{0.65}^{o}}C\]. What is the apparent percentage of dissociation of this compound in this solution? (\[{{K}_{f}}\]for water\[={{1.86}^{o}}C\,\,mo{{l}^{-1}}\])

    A) 0.33                 

    B)        0.52

    C) 0.63                  

    D)        0.79

    Correct Answer: A

    Solution :

    \[0.65=i\times 1.86\times 0.15\] \[i=2.33=1+4\alpha \] \[\alpha =-0.33\]


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