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JEE Main & Advanced JEE Main Paper (Held On 19 April 2014)

  • question_answer
    The observed osmotic pressure for a 0.10 M solution of \[Fe{{(N{{H}_{4}})}_{2}}{{(S{{O}_{4}})}_{2}}\]at 25°C is 10.8 atm. The expected and experimental (observed) values of van?t Hoff factor (i) will be respectively: \[(R=0.082Lamt\,{{k}^{-1}}mo{{l}^{-1}})\]     JEE Main Online Paper (Held On 19 April 2016)

    A) 5 and 4.42           

    B) 4 and 4.00

    C) 5 and 3.42                           

    D) 3 and 5.42

    Correct Answer: A

    Solution :

    Given \[{{\pi }_{ob}}=10.8atm\] \[{{\pi }_{nor}}=CST=0.10\times 0.0821\times 298=2.446\] now experimental value of (i) \[\text{=}\frac{\text{Observed osmotic pressure}}{\text{Normal osmotic pressure}}\]\[\text{=}\frac{10.8}{2.446}=4.42\]                


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