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NEET Sample Paper NEET Sample Test Paper-49

  • question_answer
    When 20 g of naphthoic acid \[({{C}_{11}}{{H}_{8}}{{O}_{2}})\] is dissolved in 50 g of benzene\[({{K}_{f}}=\,\,1.72\text{ }K\text{ }kgmo{{l}^{-1}})\], a freezing point depression of 2K is observed. The Van?t Hoff factor (i) is-

    A) 0.5                               

    B) 1

    C) 2                                 

    D) 3

    Correct Answer: A

    Solution :

    \[{{(\Delta {{T}_{f}})}_{Theo}}\,\,=\,\,\frac{1.72\times 20\times 1000}{172\times 50}\,\,=\,\,4\] \[\begin{align}   & i=\frac{{{(\Delta {{T}_{f}})}_{obs.}}}{{{(\Delta {{T}_{f}})}_{Theo}}}\,\,=\,\,\frac{2}{4}\,\,=\,\,0.5 \\  &  \\ \end{align}\]


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