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BCECE Engineering BCECE Engineering Solved Paper-2008

  • question_answer
    1 mole of \[{{H}_{2}}\]and 2 moles of \[{{I}_{2}}\]are taken initially in a two litre vessel. The number of moles of \[{{H}_{2}}\]at equilibrium is 0.2. Then, the number of moles of \[{{I}_{2}}\]and HI at equilibrium  are

    A) 1.2, 1.6                 

    B)        1.8, 1.0 

    C)        0.4, 2.4                 

    D)        0.8, 2.0

    Correct Answer: A

    Solution :

    \[\begin{align}   & {{H}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,+\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{I}_{2}}\,\,\,\,\,\,\,\,\rightleftharpoons \,\,\,\,\,\,\,\,\,\,\,2HI \\  & Initially\,\,\,\,\,\,\,1\,mol\,\,\,\,\,\,\,\,\,\,\,\,\,\,2\,mol\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2\,mol \\  & at\,eq.\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0.2\,mol\,\,\,\,\,\,\,\,2-0.8\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2\times 0.8 \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,=\,1.2\,mol\,\,\,\,\,\,\,\,\,\,\,=1.6\,mol \\ \end{align}\] Amount of \[{{H}_{2}}\](and hence\[{{I}_{2}}\]) consumed                                                 \[=1-0.2=0.8\]


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