Preparation of Dihydrogen :
A. Laboratory Method : i. Dihydrogen is prepared in laboratory by the action of dilute hydrochloric acid on zinc granules ii. Dihydrogen can be prepared by the action of aqueous solution of sodium hydroxide on zinc B. Industrial methods i. By electrolysis of pure water: Pure water is a poor conductor of electricity. Therefore a dilute aqueous solution of acid or alkali is used to prepare dihydrogen by electrolysis For example, electrolysis of dilute aqueous solution of sulphuric acid yields two volumes of hydrogen at cathode and one volume of oxygen at anode. ii. From carbon on hydrocarbon : Reaction of steam on hydrocarbon at 1270 Kelvin in presence of nickel catalyst gives water gas ...