Rhodium(IV) oxideRhodium oxide is the chemical compound with the formula RhO2.Chemical propertiesRhO2 is highly insoluble even in hot aqua regia.StructureRhO2 has the tetragonal rutile structure.Physical propertiesRhO2 has metallic resistivity with values <10−4 Ohm·cm. It transforms in air to Rh2O3 at 850 °C and then to metal and oxygen at 1050 °C.