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BCECE Medical BCECE Medical Solved Papers-2013

  • question_answer
    2.56 g of sulphur in 100 g of \[C{{S}_{2}}\] has depression in freezing point of \[{{0.010}^{o}}C\]. Atomicity of sulphur in \[C{{S}_{2}}\] is (Given, \[{{K}_{f}}={{0.1}^{o}}\,mola{{l}^{-1}}\])

    A)  2                      

    B)  4

    C)  6                      

    D)  8

    Correct Answer: D

    Solution :

    Let atomicity of sulphur is n, then it exists as\[{{S}_{n}}\]. \[\therefore \] Molar mass, \[m=32\,n\] Now from. \[\Delta {{T}_{f}}=\frac{1000\,w\,{{K}_{f}}}{m\,\,w}\]                 \[0.010=\frac{1000\times 2.56\times 0.1}{m\times 100}\] or            = 256 or            \[32\,\,n\,\,=256\] or \[n=\frac{256}{32}=8\]


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