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AIIMS AIIMS Solved Paper-2014

  • question_answer
     For the gas phase reaction,\[{{C}_{2}}{{H}_{4}}+{{H}_{2}}{{C}_{2}}{{H}_{6}}\,\,;\,\,\,[\Delta H=-32.7Kcal]\]Carried out in a vessel, the equilibrium concentration of \[{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\]can be increased by

    A) decreasing the pressure

    B) increasing tile temperature

    C) removing some \[{{\text{C}}_{\text{2}}}{{\text{H}}_{6}}\]

    D) adding some \[{{\text{H}}_{2}}\]

    Correct Answer: B

    Solution :

                    Since \[\Delta H\] is negative, therefore, the reaction is exothermic.   According   to   Le-Chatelier's principle, an increase in temperature in this case will favour backward reaction, i.e., will increases the number of moles of\[{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\].


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