Question

oxidation number of Ru and Os in RuO4 and OsO4​

Answer 1

Very volatile ruthenium tetroxide, RuO4, used in separating ruthenium from other heavy metals, contains the element in the +8 oxidation state. (Although ruthenium tetroxide, RuO4, has similar stability and volatility to osmium tetroxide, OsO4, it differs in that it cannot be formed from the elements.)

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