Medium
For the reaction,$A \rightleftharpoons B$,$E_a = 50 \ kJ \ mol^{-1}$ and $\Delta H = -20 \ kJ \ mol^{-1}$. When a catalyst is added,$E_a$ decreases by $10 \ kJ \ mol^{-1}$. What is the $E_a$ for the backward reaction in the presence of the catalyst?
- A$60 \ kJ \ mol^{-1}$
- B$40 \ kJ \ mol^{-1}$
- C$70 \ kJ \ mol^{-1}$
- D$20 \ kJ \ mol^{-1}$
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