Physical Properties of Dihydrogen
Dihydrogen is a colourless, odourless, tasteless, combustible gas. It is lighter than air and insoluble in water. It is neutral to litmus.
Chemical Properties of Dihydrogen:
(i) Reactivity: The relative inertness of dihydrogen at room temperature is because of its high enthalpy of H-H bond i.e. high bond dissociation energy. So, its reactions take place under specific conditions only (at high temperature).
(ii) Action with non-metals:
(iii) Reaction with metals: Here H2 acts as oxidizing agent.
(iv) Reducing action of dihydrogen:
(v) Reactions with metal ions and metal oxides:
(vi) Reaction with organic compounds:
Uses of Dihydrogen:
(By heating H2 with coal and heavy oils under very high pressure in the presence of catalyst.)