Manganese (IV) oxide, lead (IV) oxide and red lead (Pb3O4) react with concentrated hydrochloric acid to liberate chlorine.
(a) Name the common property exhibited by these metal oxides.
(b) Write the equation for the reaction of concentrated hydrochloric acid with Pb3O4.
(a) Metal oxides react with hydrochloric acid to liberate chlorine gas. In these reactions, hydrochloric acid is oxidised to chlorine, thereby, depicting its reducing property.
(b) Reaction with concentrated hydrochloric acid can be represented as follows:
Pb3O4(s) + 8HCl(aq) → 3PbCl2 (aq) + 4H2O(l) + Cl2(g)
Trilead Lead chloride
tetroxide
(red)