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JEE Main & Advanced Sample Paper JEE Main Sample Paper-31

  • question_answer
    1 mol \[C{{H}_{3}}COOH\] is added in \[250\,g\] benzene. Acetic acid dimerises in benzene due to hydrogen bond. \[{{K}_{b}}\] of benzene is \[2\,K\,kg\,mo{{l}^{-1}}\]. The boiling has increased by \[6.4\,K%\] dimerisation of acetic acid is:

    A) 60                          

    B)    40

    C) 30                                          

    D) 20

    Correct Answer: B

    Solution :

    Given molality\[=\frac{1\times 1000}{250}=4m,\,\,6.4=1\times 2\times 4\] or\[i=0.8\] For dimerisation \[i=1-\frac{\beta }{2}\] \[\Rightarrow 0.8-1=-\frac{\beta }{2}\] \[\beta =0.4\Rightarrow 40%\]


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