Respected Sir, in the temperature dependence of reaction rate, we say that with every 10 degree rise in temperature, the rate of a reaction become two times or three times. But in some books, I have read that when the temperature difference is only in between the 25 degree centigrade to 35 degree centigrade, only then the reaction rate becomes double or triple and is not valid for the rest of the temperature differences. But in some examination, this temperature Coefficient is applied to any temperature difference. So, my question is that the temperature Coefficient is only valid for the temperature difference between 25 to 35 degree centigrade or at all temperatures. please guide me sir. thank you so much.