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WHAT HAVEWE LEARNED. The complexes of manganese(III) include [Mn(CN)6] ~ (formed when manganese(II) salts are oxidised in presence of cyanide ions), 2 and [MnF5(H2O)] ~, formed when a manganese(II) salt is oxidised by a manganate(VII) in presence of hydrofluoric acid : 2 3 4Mn 8H MnO4 -5Mn 4-4H2O 3 2 Mn H2O 5F" -» [MnF5(H2O)] ~ Oxidation of manganese(II) hydroxide by air gives the brown hydrated oxide Mn2O3.
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