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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2013

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

    A)  \[0.01M\]urea     

    B)  \[0.01M\] \[KN{{O}_{3}}\]

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

    D)  \[0.015M\]\[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]

    Correct Answer: C

    Solution :

    :  \[\Delta T=i\times {{K}_{b}}\times m\]
    Compound Urea \[KN{{O}_{3}}\] \[N{{a}_{2}}S{{O}_{4}}\] \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]
    No, of ions (i) 1 2( \[{{K}^{+}}\] and \[NO_{3}^{-}\]) 3(\[2N{{a}^{+}}\] and \[SO_{4}^{2-}\]) 1
    \[i\times m\] \[0.01\] \[0.02\] \[0.03\] \[0.015\]
    \[i\times m\] of \[N{{a}_{2}}S{{O}_{4}}\] is highest, hence its boiling point will also be highest.


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