explain in reaction 

1. activation energy can be zero
2. activation energy can be negative

Dear Student,

Please find below the link of a similar query as asked by you: 

https://www.meritnation.com/ask-answer/question/can-activation-energy-be-zero/chemical-kinetics/7021997

https://www.meritnation.com/ask-answer/question/can-activation-energy-ea-be-negative-give-reason/chemical-kinetics/7024206

We hope the above link will help you in clearing the doubt.

Regards