Question

why does hydrogen react mostly at higher temperature?

Answer 1

Answer:

The H-H bond in H2 is actually a really strong bond (Average Bond Enthalpy of H-H bond = 432kJ/mole) and because hydrogen has only one electron in its valance shell which is tightly held by the nucleus,so at the time of reaction it is difficult for hydrogen atom to lose its one electron,ie.,a lot of energy is required for Hydrogen to react(High Activation energy)or we need a catalyst like Palladium or Platinum to lower that high energy requirement. Therefore it mostly reacts at high temperature.