NEET Sample Paper NEET Sample Test Paper-51

  • question_answer 69) In a 0.2 molal aqueous solution of a weak acid HX the degree of ionization is 0.3. Taking \[Kf\] for water as 1.85, the freezing point of the solution will be nearest to-

    A) \[-0.260{}^\circ C\]                  

    B) \[+\,0.480{}^\circ C\]

    C) \[-0.480{}^\circ C\]                  

    D) \[-0.360{}^\circ C\]

    Correct Answer: C

    Solution :

    \[\Delta {{T}_{f}}={{K}_{f}}\times m\] \[{{(\Delta {{T}_{f}})}_{obs.}}=i\times {{K}_{f}}\,\times \,m\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\alpha =\frac{i-1}{n-1}\] \[=1.3\times 1.85\times 0.2\,\,\,0.3=\frac{i-1}{2-1}\] \[=\,\,0.481\]

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