2. Sample Papers
  3. KVPY

KVPY Sample Paper KVPY Stream-SX Model Paper-3

  • question_answer
    The freezing point of aqueous solution that contains 3 % urea, 7.45 % KCl and 9 % of glucose is (given \[{{K}_{f}}\] of water =1.86 and assume molarity = molarity)

    A) 290 K               

    B) 285.5 K

    C) 267.42 K          

    D) 250 K

    Correct Answer: C

    Solution :

    [C]
    \[\Delta {{T}_{f}}=i.m.\,\,{{k}_{f}}\]
    \[\Delta {{T}_{f}}={{i}_{1}}{{m}_{1}}{{K}_{f}}+{{i}_{2}}{{m}_{2}}{{K}_{f}}+{{i}_{3}}{{m}_{3}}{{K}_{f}}\]\[=({{m}_{1}}+2{{m}_{2}}+{{m}_{3}}).{{K}_{f}}\]
    \[\Delta {{T}_{f}}=\frac{\frac{3}{60}+\frac{7.45\times 2}{74.5}+\frac{9}{180}}{100}\times 1000\times 1.86\]
    \[\Delta {{T}_{f}}=3\times 1.86\,=5.58\]
    \[{{T}_{f}}\,of\,\,solution=273-5.58=267.42\,K\]
               


You need to login to perform this action.
You will be redirected in 3 sec spinner