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NEET Sample Paper NEET Sample Test Paper-69

  • question_answer
    A 0.2 molal aqueous solution of a weak acid (HX) is \[20%\] ionised. The freezing point of this solution is (Given \[{{\operatorname{K}}_{f}}=1.86{}^\circ  C/m\] for water)

    A) \[-0.31{}^\circ C\]                    

    B) \[-0.45{}^\circ C\]

    C) \[-0.53{}^\circ C\]                    

    D) \[-0.90{}^\circ C\]

    Correct Answer: B

    Solution :

    \[\Delta {{T}_{f}}=molality\,\,\times \,\,{{K}_{f}}\times (1+\alpha )\] \[\alpha =0.2\,\,Molality=0.2,\,\,{{K}_{f}}=1.86\] \[\Delta {{T}_{f}}= 0.2 \times  1.2 \times  1.86 = 0.4464\] \[Freezing point = -0.45{}^\circ C.\]


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