Preparation of Dihydrogen (1) From water Dihydrogen may be obtained from water by reduction either with active metals or by electricity. (a) By the action of water on Active Metals (1) Cold Water : Very active metals i.e. alkali and certain alkaline earth metals like Na, K , Ca react with water at room temperature evolving dihydrogen. 2Na + 2H2O -----------> 2NaOH + … [Read more...] about Preparation of Hydrogen