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AMU Medical AMU Solved Paper-2001

  • question_answer
    Which of the following solutions boils at the highest temperature?

    A)  0.1 M NaCI                        

    B)  0.1 M urea

    C)  0.1 M \[BaC{{l}_{2}}\]   

    D)  0.1 M glucose

    Correct Answer: C

    Solution :

                     Key Idea             \[\Delta {{T}_{b}}={{T}_{2}}-{{T}_{1}}\] where, \[{{T}_{2}}\] is boiling temperature of solution\[{{T}_{1}}\] is boiling temperature of solvent.                 \[\Delta {{T}_{b}}=i\times {{K}_{b}}\times \] molality Here, molality of all solution is same. So,                                 \[\Delta {{T}_{b}}\propto i\] where, i = vant Hoff factor                                 \[i=[1+(y-1)x]\] where, y = number of products                                                 (ion or molecule)                                                 \[i=[1+(y-1)x]\]                                                 Here, \[x=1\]    
    Solute lonisation y Assume complete ionisation
     NaCI \[N{{a}^{+}}+C{{l}^{-}}\] 2 2
     Urea    No ionisation take place (non-electrolyte) 1 1
     \[BaC{{l}_{2}}\]   \[B{{a}^{2+}}+2C{{l}^{-}}\] 3 3
     Glucose No ionisation takes place(non-electrolyte) 1 1
    Greater the value off, greater the value of \[\Delta {{T}_{b}}\] and greater the value of boiling point. Here, the value of i for \[BaC{{l}_{2}}\] solution is maximum therefore, the boiling point of \[BaC{{l}_{2}}\] solution is maximum.


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