JCECE Medical JCECE Medical Solved Paper-2008

  • question_answer Which one of the following aqueous solutions will exhibit highest boiling point?

    A)  \[0.01\,M\,N{{a}_{2}}S{{O}_{4}}\]

    B)  \[0.01\,M\,KN{{O}_{3}}\]

    C)  \[0.015\,M\,\text{urea}\]

    D)  \[0.015\,M\,\text{glucose}\]

    Correct Answer: A

    Solution :

     Boiling point \[={{T}_{0}}(Solvent)+{{T}_{b}}\] (Elevation in b. p.) \[\Delta {{T}_{b}}=mi{{k}_{b}}\] where, m is the molality ie, the van't Hoff factor (i) \[=[1+(y-1)x]\] \[{{k}_{b}}=\]molal elevation constant. Thus,        \[\ \Delta {{T}_{b}}\propto im\] Assume 100% ionization [a]\[mi(N{{a}_{2}}S{{O}_{4}})=0.01\times 3=0.03\] [b] \[mi(KN{{O}_{3}})=0.01\times 2=0.02\] [c] \[mi(glucose)=0.015\]

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