2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-32

  • question_answer
    1 mol \[C{{H}_{3}}OOH\] is added in 250 g benzene. Acetic acid diereses in benzene due to hydrogen bond K of benzene is \[2\text{ }K\text{ }kgmo{{l}^{-1}}\]. The boiling point has increased by 6.4K. % dimerisation of acetic acid is:

    A) 150        

    B)                                    40

    C) 30      

    D)                                    20

    Correct Answer: B

    Solution :

    \[\Delta {{T}_{b}}\,=i\,{{K}_{b}}\,m\]                 Given molality \[=\frac{1\times 1000}{250}\,=4m,\] \[6.4\,=i\times 2\times 4\,\,\,or\,\,i=\,80\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0.8-1=\frac{-\beta }{2}\]         or \[\beta =0.4\,\Rightarrow \,40%\]


You need to login to perform this action.
You will be redirected in 3 sec spinner