NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    The molal elevation constant of water = 0.52 K\[molalit{{y}^{-1}}\]. The boiling point of 1.0 molal aqueous \[KCl\] solution (assuming complete dissociation of\[KCl\]), should be -

    A) \[100.52{}^\circ C\]

    B)                    \[101.04{}^\circ C\]

    C)                    \[99.48{}^\circ C\]

    D)                    \[98.96{}^\circ C\]

    Correct Answer: B

    Solution :

    \[\alpha \,\,=\,\,\frac{i-1}{n-1}\,\,\Rightarrow \,\,l\,\,=\,\,\frac{i-1}{2-1}\] \[\Rightarrow i=2\] \[\Delta {{T}_{b}}=i\times {{K}_{b}}\times m\] \[T-100{}^\circ C=2\times 0.52\times 1\] \[T=100{}^\circ C+1.04\] \[T=101.04{}^\circ C\]


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