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NEET Sample Paper NEET Sample Test Paper-86

  • question_answer
    The observed osmotic pressure for a 0.10 M solution of \[Fe{{(N{{H}_{4}})}_{2}}{{(S{{O}_{4}})}_{2}}\] at \[25{}^\circ C\] is 10.8 atm. The expected and experimental (observed) values of van't Hoff factor (i) will be respectively: \[(R=0.082\,\,L\,\,atm\,\,{{K}^{-1}}\,\,mo{{l}^{-1}})\]

    A) 5 and 4.42

    B)        4 and 4.00

    C) 5 and 3.42        

    D)        3 and 5.42

    Correct Answer: A

    Solution :

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


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