can activation energy Ea, be negative.give reason?

It is possible however, not seen generally but the negative value is possible when the reaction rate decreases with increase in temparatur and in such conditions you can not stop a reaction to occur the elementary reactions of such nature are barrier less. 

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I dont think so... Because activation energy is defined as the energy required to form the activated complex (intermediate) and I think Ea can be zero for nuclear reactions...

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