NOVELTY - Apparatus (1) comprises container (2) made of electrically insulating material and defining an internal volume (20); casing (3) made of electrically conductive metal material, inserted into the internal volume; side plate units made of zinc and/or cadmium metal alloy and fixed in contact with opposite sides of central plate units made of metal alloy containing transition metals; and reaction solution (S) comprising water, a non-ionic surfactant containing hydrochloric acid, titanium dioxide in powder form, phosphoric acid solution and acid solution containing sulfuric acid.    USE - For generating hydrogen and oxygen (claimed).    ADVANTAGE - The present apparatus enables large quantities of hydrogen and oxygen in gaseous form to be generated from an inexpensive acid water solution, without the need to supply external electric and/or thermal energy. The present apparatus enables hydrogen and oxygen to be generated by exothermic electrochemical reactions that develop little heat. The present apparatus is very compact, can be dimensioned according to the required production and is easily transported and installed at the end users.    DETAILED DESCRIPTION - Apparatus (1) for generating hydrogen and oxygen comprises: a container (2) made of electrically insulating material and defining an internal volume (20); a casing (3) made of electrically conductive metal material, inserted into the internal volume; side plate units made of zinc and/or cadmium metal alloy and fixed in contact with opposite sides of central plate units made of metal alloy containing transition metals, in particular iron and/or nickel, where the side plate unit and central plate unit is housed inside the casing, and the side plate means is in electrical connection with the casing; and a reaction solution (S) arranged for filling the internal volume until it covers completely the casing and arranged for interacting with the side plate unit and the central plate unit for generating hydrogen and oxygen in gaseous form, where the reaction solution comprising water, a non-ionic surfactant containing hydrochloric acid (HCl), titanium dioxide (TiO2) in powder form, a phosphoric acid solution (H3PO4) and an acid solution containing sulfuric acid (H2SO4). An INDEPENDENT CLAIM is included for method for generating hydrogen and oxygen using the apparatus involving in an initial step introducing into the apparatus in sequence so as to form a reaction solution: titanium dioxide (TiO2) in 0.003-0.006 (particularly equal to 0.004) vol.%; a phosphoric acid solution in 4-7 (particularly equal to 5.737) vol.%; water in 45.9-80 (particularly 45.890-79.964) vol.%; and acid solution in 14-48.2 (particularly 14.111-48.185) vol.%, and containing sulfuric acid and non-ionic surfactant containing hydrochloric acid in an amount of 0.15-0.20% ((particularly equal to 0.184%).    DESCRIPTION OF DRAWING(S) - The figure shows a partially sectioned schematic frontal view of the apparatus for generating hydrogen and oxygen.    Apparatus (1)    Container (2)    Casing (3)    Supporting element (7)    Inlet conduit (13)    Outlet conduit (14)    Internal volume (20)    Valve (25)    Reaction solution (S)