NEET Sample Paper NEET Sample Test Paper-14

  • question_answer 62) What is the osmotic pressure of a \[0.0020\,\text{mol}\,\text{d}{{\text{m}}^{-3}}\]sucrose\[({{C}_{12}}{{H}_{22}}{{O}_{11}})\] solution at \[20{}^\circ C\]? (Molar gas constant R\[R=8.314\,J{{K}^{-1}}\,mo{{l}^{-1}};\]\[d{{m}^{3}}=0.001\,{{m}^{3}}\])

    A)  4870 Pa                     

    B)  4.87 Pa

    C)  0.00487 Pa                

    D)  0.33 Pa

    Correct Answer: A

    Solution :

    \[\pi =CRT\] \[C=0.002\,\text{mol}\,\text{d}{{\text{m}}^{-3}}=\text{2}\,\text{mol}\,{{\text{m}}^{-3}}.\] \[R=8.314\,J\,{{K}^{-1}}\,mo{{l}^{-1}},T=293\,K.\] \[\pi =CRT=2\times 8.314\times 293=4872.004\,\text{Pa}\text{.}\] Hence, the correct option is [a].

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