Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

In a reversible reaction, the forward reaction is exothermic and has an activation energy of $+30\,\text{kJ mol}^{-1}$. The reverse reaction follows a mechanism that is precisely the reverse of the forward reaction mechanism. Which statement about the activation energy for the reverse reaction is correct?

  • AThe activation energy for the reverse reaction is equal to $-30\,\text{kJ mol}^{-1}$.
  • BThe activation energy for the reverse reaction is greater than $0\,\text{kJ mol}^{-1}$ but less than $+30\,\text{kJ mol}^{-1}$.
  • CThe activation energy for the reverse reaction is equal to $+30\,\text{kJ mol}^{-1}$.
  • DThe activation energy for the reverse reaction is greater than $+30\,\text{kJ mol}^{-1}$.

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