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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2008

  • question_answer
        4 moles each of\[S{{O}_{2}}\]and\[{{O}_{2}}\]gases are allowed to react to form\[S{{O}_{2}}\]in a closed vessel. At equilibrium 25% of\[{{O}_{2}}\]is used up. The total number of moles of all the gases at equilibrium is

    A)  6.5                                        

    B)  7.0

    C)  8.0                                        

    D)  2.0

    Correct Answer: A

    Solution :

                     
    \[2S{{O}_{2}}\] \[+\] \[{{O}_{2}}\] \[2S{{O}_{3}}\]
    initrally 4 4 0
    at equil. \[4(1-0.25)\] \[4(1-0.25)\] \[0.25\times 2\]
    Total number of moles at equilibrium \[=4(1-0.25)+4(1-0.25)+0.5\] \[=4-1+4-1+0.5=6.5\]


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