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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        At STP a container has 1 mole of Ar, 2 mol of \[C{{O}_{2}},\]3 mol of\[{{O}_{2}}\]and 4 mol of\[{{N}_{2}}\]without changing the total pressure if one mole of\[{{O}_{2}}\]is removed, the partical pressure of\[{{O}_{2}}\]

    A)  is change by about 16%

    B)  is halved

    C)  is changed by 26%

    D)  is unchanged

    Correct Answer: C

    Solution :

                    Partial pressure of a gas\[\alpha \]mole fraction mole fraction of\[{{O}_{2}}\]at start \[=\frac{3}{10}\times 100=30\] mole fraction of\[{{O}_{2}}\]at final stage \[=\left( \frac{3}{10}-\frac{2}{9} \right)\times 100=\frac{70}{9}=8\] % change\[=\frac{8}{30}\times 100\approx 26%\]


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