JEE Main & Advanced Chemistry Equilibrium Question Bank Activation energy, Standard free energy and Degree of dissociation and Vapour density

  • question_answer The standard state gibbs free energy change for the given isomerization reaction cis-2-pentene ⇌ trans ?2 -pentene is                                                                                        \[-3.67\,kJ/mol\]  at \[400K\]. If more trans-2-pentene is added to the reaction vessel, then [CBSE PMT 1995; BHU 1999; AFMC 2000]

    A)                 More cis ?2?pentene is formed

    B)                 Equilibrium is shifted in the forward direction

    C)                 Equilibrium remains unaffected

    D)                 Additional trans?2?pentene is formed

    Correct Answer: A

    Solution :

              Equilibrium shifts backward by Le-chatelier?s principle.


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