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NEET Chemistry Solutions / विलयन Question Bank Self Evaluation Test - Solutions

  • question_answer
    How many grams of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268K? (\[{{K}_{f}}\]for water is \[1.86Kkgmo{{l}^{-1}}\])

    A) 880.07 g           

    B) 899.04 g

    C) 886.02 g                       

    D) 868.06 g

    Correct Answer: D

    Solution :

    [d] \[\Delta {{T}_{f}}={{K}_{f}}m\] where w=molality \[273-268=1.86\times \frac{w}{M\times v}\] \[5=1.86\times \frac{w}{32\times 10}\] \[w=\frac{5\times 32\times 10}{1.86}\] \[=860.2\approx 868.06\text{ }g\]


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