At $298 \text{ K}$ temperature,the activation energy for the reaction $x_2 + y_2 \rightarrow 2xy + 20 \text{ kJ}$ is $15 \text{ kJ}$. What will be the activation energy for the reaction $2xy \rightarrow x_2 + y_2$?
- A$-15 \text{ kJ}$
- B$+35 \text{ kJ}$
- C$-5 \text{ kJ}$
- D$-35 \text{ kJ}$
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