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Ruthenium is a chemical element; ... Ruthenium tetroxide is reduced by cold dilute potassium hydroxide to form black potassium perruthenate, KRuO 4, ...
Ruthenium(IV) oxide is the inorganic compound with the formula Ru O 2. This black solid is the most common oxide of ruthenium . It is widely used as an electrocatalyst for producing chlorine, chlorine oxides, and O 2 . [ 1 ]
Ruthenium trichloride is a well-known compound, existing in a black α-form and a dark brown β-form: the trihydrate is red. [7] Of the known trihalides, trifluoride is dark brown and decomposes above 650 °C, tribromide is dark-brown and decomposes above 400 °C, and triiodide is black. [ 6 ]
Laurite is an opaque black, metallic ruthenium sulfide mineral with formula: RuS 2. It crystallizes in the isometric system. It is in the pyrite structural group. Though it's been found in many localities worldwide, it is extremely rare. Laurite has a Mohs hardness of 7.5 and a specific gravity of 6.43.
The black tarnish commonly seen on silver arises from its sensitivity to sulphur containing gases such as hydrogen sulfide: 2 Ag + H 2 S + 1 / 2 O 2 → Ag 2 S + H 2 O. Rayner-Canham [4] contends that, "silver is so much more chemically-reactive and has such a different chemistry, that it should not be considered as a 'noble metal'."
Ruthenium tetroxide is the inorganic compound with the formula RuO 4. It is a yellow volatile solid that melts near room temperature. [2] It has the odor of ozone. [3] Samples are typically black due to impurities. The analogous OsO 4 is more widely used and better known. It is also the anhydride of hyperruthenic acid (H 2 RuO 5).
Pages in category "Ruthenium compounds" The following 13 pages are in this category, out of 13 total. This list may not reflect recent changes. ...
Ruthenium(III) iodide is a chemical compound containing ruthenium and iodine with the formula RuI 3. It is a black solid. [2] Preparation. Ruthenium(III) iodide can ...
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