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NEET Chemistry Solutions / विलयन Question Bank Self Evaluation Test - Solutions

  • 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 experimental (observed) value of van't Hoff factor will be: \[\left( R=0.082\text{ }L\text{ }atm\text{ }{{k}^{-1}}mo{{l}^{-1}} \right)\]

    A) 4.42                 

    B) 4.00

    C) 3.42               

    D) 5.42

    Correct Answer: A

    Solution :

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


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