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Why do most of the reactions of H(2) occ...

Why do most of the reactions of `H_(2)` occur at much higher temperature?

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Due to much higher bond dissociation enthalpy of H-H bond, dihydrogen is quite stable and relatively inert at room temperature. It dissociates into atoms at about 5000K. For this reason, most of the reactions of dihydrogen occur at much higher temperature.
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