An exothermic reaction X \(\to\) Y has an activation energy 30 kJ mol –1 . If energy change \(\left(△\mathrm{H}\right)\)…

An exothermic reaction X \(\to\) Y has an activation energy 30 kJ mol^–1. If energy change \(\left(△\mathrm{H}\right)\) during the reaction is –20 kJ, then the activation energy for the reverse reaction is.....(kJ)

[JEE Main 2021, 26 Feb (Shift 1)]