The activation energy decreases with increase in temperature. why?

Answer: If we increase the temperature, the kinetic energy of the molecules will increase and they will need less extra energy and hence lesser activation energy to overcome the threshold energy barrier.

Answer: activation energy is the minimum energy required for reactants to be converted to products.

Explanation:increase in temperature, weakens the bonds between molecules of reactants, thereby the molecules' kinetic energy is increased which led to frequent collusion of reactants molecules, when this happens, energy is produce. the higher the temperature of a reaction the more the collusion and the more energy is produced, which we lead to reaching the activation the activation energy faster and more products are formed