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JEE Main & Advanced Sample Paper JEE Main Sample Paper-22

  • question_answer
    75.2g of \[{{C}_{6}}{{H}_{5}}OH\]  (phenol) is dissolved in a 1 Kg solvent of \[{{K}_{f}}=14\]if the depression in freezing point is 7K then find the % of phenol that dimerises :

    A)  50%                            

    B)  75%

    C)  25%                            

    D)  99%

    Correct Answer: A

    Solution :

    \[\Delta {{T}_{f}}=i{{k}_{f}}m\] \[7=i\times 14\,\times \frac{75.2}{94}\] \[\frac{5}{8}=i\] \[1\times \left( \frac{1}{2}-1 \right)B=\frac{5}{8}\]


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