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NEET Sample Paper NEET Sample Test Paper-47

  • question_answer
    For the chemical equilibrium, \[{{\operatorname{CaCO}}_{3}} \left( s \right)\rightleftharpoons CaO\left( s \right)+C{{O}_{2}} \left( g \right)\] \[\Delta {{H}^{o}}_{r}\]Can be determined from which of the following plots?

    A)          

    B)

    C)    

    D)

    Correct Answer: A

    Solution :

    For the reaction \[{{\operatorname{K}}_{p}}={{P}_{C{{O}_{2}}}}\,\,or\,\,{{P}_{C{{O}_{2}}}}/P{}^\circ \] \[\operatorname{P}{}^\circ  = reference pressure of 1 atm\] According to van't Hoff equation, \[\operatorname{d}\frac{\ell nkp}{dT}=\frac{\Delta {{H}^{o}}}{R{{T}^{2}}}\] \[\operatorname{In}\,\,{{K}_{p}}=\frac{-\Delta {{H}^{o}}}{RT}+\operatorname{I}\] \[\operatorname{Or} 2.303 log {{P}_{C{{O}_{2}}}} /P{}^\circ =\frac{\Delta {{H}^{o}}}{RT}+I\] Hence plot of log \[{{P}_{C{{O}_{2}}}} /P{}^\circ \] versus 1/T will be a straight line with a negative slope.


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