The monoxides and dioxides of germanium, tin, and lead are all known. Especially when obtained as
precipitates, the oxides contain water and consist of a mixture of the oxide, hydroxide, and hydrous
oxide. For example, GeO, GeO x H 2 O, and Ge(OH) 2 (which could be written as GeO H 2 O) all exist in
equilibria or in mixtures. GeO is obtained from the reaction