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JEE Main & Advanced Chemistry Solutions / विलयन Sample Paper Topic Test - Solutions

  • question_answer
    At \[20{}^\circ C\] and 1.00 atm partial pressure of hydrogen, 18 mL of hydrogen, measured at STP, dissolves in 1L of water. If water at \[20{}^\circ C\]is exposed to a gaseous mixture having a total pressure of 1400 Torr (excluding the vapour pressure of water) and containing 68.5% \[{{H}_{2}}\] by volume, find the volume of \[{{H}_{2}},\] measured at STP, which will dissolve in 1L of water.

    A) 18 mL

    B) 12 mL

    C) 23 mL

    D) 121 mL

    Correct Answer: C

    Solution :

    [c] \[p({{H}_{2}})=(1400Torr)(0.685)\]
    \[=959Torr\equiv 959/760atm=1.26atm\]
    According to Henry's law
    “Amount of gas absorbed is directly proportional to pressure.”
    Hence\[\frac{V}{18mL}=\frac{1.26atm}{1atm}\]              
                \[V=23mL\]


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