dithionous acid

World English Dictionary
dithionous acid (daɪˈθaɪənəs)
hyposulphurous acid, Also called: hydrosulphurous acid an unstable dibasic acid known only in solution and in the form of dithionite salts. It is a powerful reducing agent. Formula: H2S2O4
[from di-1 + thion-, from Greek theion sulphur + -ous]

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