JCECE Medical JCECE Medical Solved Paper-2011

  • question_answer
    \[\text{0}\text{.1 M NaCl}\]and \[\text{0}\text{.1 M C}{{\text{H}}_{\text{3}}}\text{COOH}\]are kept in separate containers. If their osmotic pressures are \[{{p}_{1}}\]and \[{{p}_{2}}\]respectively then what is the correct statement?

    A) \[{{p}_{1}}>{{p}_{2}}\]

    B)  \[{{p}_{1}}={{p}_{2}}\]

    C)  \[{{p}_{1}}<{{p}_{2}}\]

    D)  \[{{p}_{1}}={{p}_{2}}=0\,\text{atm}\]

    Correct Answer: A

    Solution :

     \[\pi =iCRT\] \[{{\pi }_{NaCl}}=2\times 0.1\times RT={{p}_{1}}\] \[(i=2\,\text{for}\,NaCl)\] \[{{\pi }_{C{{H}_{3}}COOH}}=1.3\times 0.1\times RT={{p}_{2}}\] (\[i<2for\,C{{H}_{3}}COOH\]as it is a weak acid.) \[\Rightarrow \] \[{{p}_{1}}>{{p}_{2}}\]


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