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12th Class Chemistry Solutions / विलयन Question Bank Case Based (MCQs) - Solutions

  • question_answer
    What is the osmotic pressure of a solution prepared by dissolving 25 mg of \[{{K}_{2}}S{{O}_{4}}\] (Mol. mass = 174 g \[mo{{l}^{-1}}\]) in 2 L of water at \[25\text{ }{}^\circ C\], assuming that it is completely dissociated.

    A) \[5\centerdot 38\times {{10}^{-3}}atm\]

    B) \[5\centerdot 27\times {{10}^{-3}}atm\]

    C) \[3\centerdot 37\times {{10}^{-3}}atm\]

    D) None of these.

    Correct Answer: B

    Solution :

     i= 3 for \[{{K}_{2}}S{{O}_{4}}\] \[\pi =i.\frac{{{W}_{2}}RT}{{{M}_{2}}V}\] \[=\frac{3\times 25\times {{10}^{-3}}\times 0.0821\times 298}{174\times 2}\] \[=5.27\times {{10}^{-3}}\]atm.


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