CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2007

  • question_answer
    If the elevation in boiling point of a solution of 10 g of solute (mol. wt. = 100) in 100 g of water is\[\Delta {{T}_{b}},\]the ebullioscopic constant of water is

    A)  10                         

    B)         \[100\,{{T}_{b}}\]

    C)  \[\Delta {{T}_{b}},\] 

    D)                                         \[\frac{\Delta \,{{T}_{b}}}{10}\]

    E)  \[10\,{{T}_{b}}\]

    Correct Answer: C

    Solution :

    \[m=\frac{1000\times {{k}_{b}}\times w}{W\times \Delta {{T}_{b}}}\] \[\Delta {{T}_{b}}=\frac{1000\times {{k}_{b}}\times w}{W\times m}\] \[\Delta {{T}_{b}}=\frac{1000\times {{k}_{b}}\times 10}{100\times 100}\]              \[\Delta {{T}_{b}}={{k}_{b}}\]


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