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12th Class Chemistry Solutions / विलयन Question Bank Case Based (MCQs) - Solutions

  • question_answer
    Benzoic acid undergoes demerisation in benzene solution. The Van't Hoff factor is related to degree of association '\[\alpha \]' of the acid as :

    A) \[i\,=1-\alpha \]

    B) \[i\,=1+\alpha \]

    C) \[i\,=1-\alpha /2\]

    D) \[i\,=1+\alpha /2\]

    Correct Answer: C

    Solution :

    \[\alpha =\frac{i-1}{\left( \frac{1}{n}-1 \right)}=\frac{\left( i-1 \right)}{\left( \frac{1}{2}-1 \right)}\] \[\left( i-1 \right)=-\frac{1}{2}\alpha \] or \[i=1-\frac{1}{2}\alpha \]


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