Rhodium (Rh) is uniquely efficient at reducing nitrogen oxides ( NOxcap N cap O sub x
Au3++3e−→Aucap A u raised to the 3 plus power plus 3 e raised to the negative power right arrow cap A u +1.52Vpositive 1.52 cap V Chemistry of Precious Metals
Most are insoluble in standard acids. Gold and platinum require Aqua Regia (a 3:1 mixture of HClcap H cap C l HNO3cap H cap N cap O sub 3 HNO3cap H cap N cap O sub 3 acts as an oxidant, while the Cl−cap C l raised to the negative power Rhodium (Rh) is uniquely efficient at reducing nitrogen
) are central to modern solar energy conversion and light-driven organic synthesis due to their long-lived excited states. Summary Table Key Property Common Use Extreme malleability; Relativistic color Electronics, Jewelry, Nanomedicine Silver (Ag) Highest thermal/electrical conductivity Photography (historically), Antimicrobials Palladium (Pd) Hydrogen "sponge" Hydrogenation, Catalytic converters Platinum (Pt) High melting point; Bio-compatibility Chemotherapy, Fuel cells Rhodium (Rh) Extreme corrosion resistance NOxcap N cap O sub x reduction in vehicles Precious metals are often called "noble" because they
) to nitrogen gas, while Pt and Pd oxidize carbon monoxide and unburnt hydrocarbons.
Precious metals are often called "noble" because they resist oxidation and protonic acids.