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12th Class Chemistry Solutions / विलयन Question Bank MCQs - Solutions

  • question_answer
    \[{{H}_{2}}S\] gas is used in qualitative analysis of inorganic cations. Its solubility in water at STP is 0.195 mol \[k{{g}^{-1}}\]. Thus, Henry's law constant (in atm \[mola{{l}^{-1}}\]) for \[{{H}_{2}}S\] is

    A) \[3.826\times {{10}^{3}}\]

    B) 5.128

    C) \[1.80\times {{10}^{2}}\]

    D) \[2.628\times {{10}^{-4}}\]

    Correct Answer: B

    Solution :

    According to Henry’s law,
    \[p={{K}_{H}}\cdot \chi ={{K}_{H}}S\]                                  (where, S = solubility)
    \[\therefore \] \[{{K}_{H}}=\frac{P}{S}\]\[=\frac{1\,\,atm}{0.195\,\,mol\,\,k{{g}^{-1}}}\]
    = 5. 128 atm kg \[mo{{l}^{-1}}.\]


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