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Osmium Bisulphide, OsS2

Osmium Bisulphide, OsS2, results when a current of hydrogen sulphide is passed over dry osmium oxysulphide (vide infra), which is gently warmed. At higher temperatures the reaction is very vigorous, the whole mass glowing with heat:

Os2O3(SH)2 + 2H2S = 2OsS2 + 3H2O.

It is also produced on passing hydrogen sulphide through a neutral solution of an alkali osmate or chlorosmate.

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