A) 58 kJ
B) \[~-\text{ }40\text{ }kJ\]
C) \[~-\text{ }18\text{ }kJ\]
D) \[~22\text{ }kJ\]
Correct Answer: A
Solution :
\[A+B\xrightarrow{{}}C+D+40\,kJ\] \[\because \] Activation energy for the forward reaction, \[A+B\xrightarrow{{}}C+D=18\,kJ\] \[\therefore \] Activation energy for the reverse reaction, \[C+D\xrightarrow{{}}A+B=40+18=58\,kJ\]
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