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KVPY Sample Paper KVPY Stream-SX Model Paper-16

  • question_answer
    A solution containing 62 g ethylene glycol in 250 water is cooled to \[-10{}^\circ C.\] If \[{{K}_{f}}\] for water is 1.86 K kg \[mo{{l}^{-\,1}}\] the amount of water (in g) separated as ice is :

    A) 48

    B) 32

    C) 64

    D) 16

    Correct Answer: C

    Solution :

    Let moles of \[{{H}_{2}}O\]separated as ice\[=xgm\] \[\Delta {{T}_{f}}=i\,\,{{K}_{f}}m\] \[10=1\times 1.86\frac{\frac{62}{62}}{\frac{250-x}{100}}\] \[x=64\text{ }gm.\]


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