hypophosphorous acid
noun
hy·po·phos·pho·rous acid
-ˌfäs-f(ə-)rəs-; -fäs-ˌfōr-əs-
-ˌfȯr-
: a low-melting deliquescent crystalline strong monobasic acid H3PO2 usually obtained by acidifying one of its salts and used as a reducing agent
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Merriam-Webster unabridged
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