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

  • question_answer
    At \[15{}^\circ C\] and 1 atmosphere partial pressure of hydrogen, 20 mL of hydrogen measured at STP dissolves in 1 L of water. If water at \[15{}^\circ C\] is exposed to a gaseous mixture having a total pressure of 1500 mm of Hg (excluding the vapour pressure of water) and containing 80% hydrogen by volumne, then the volume of hydrogen measured at STP that will dissolve in 1 L of water is

    A) 20.0 mL           

    B) 31.6 mL

    C) 36.1 mL           

    D) 26.3 mL

    Correct Answer: B

    Solution :

    [b] From the given data \[{{P}_{H2}}=1500\times 0.80\] = 1200 mm of \[Hg=\frac{1200}{760}\] atmosphere =1.58 atmosphere If's are volumes of gas dissolved by same volume of liquid, then from Henry's law \[\frac{{{V}_{2}}}{{{V}_{1}}}=\frac{{{P}_{2}}}{{{P}_{1}}};\,or\,\frac{{{V}_{2}}}{20}=\frac{1.58}{1.0}\] Or \[{{V}_{2}}=31.60mL\]


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