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A monobasic acid of phosphorus, which reduces `HgCl_2` to black Hg is

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A monobasic acid of phosphorus, which reduces `HgCl_2` to black Hg is
A. hypophosphorus acid
B. phosphoric acid
C. metaphosphoric acid
D. pyrophosphoric acid
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`H_(3)PO_(2)` shows reducing properties
`H_(3)PO_(2)+4HgCl_(2)+2H_(2)O to 2Hg_(2)Cl_(2)+4HCl+H_(3)PO_(4)`
`2HgCl_(2)+H_(3)PO_(2)+2H_(2)O to 4Hg+4HCl +H_(3)PO_(4)`
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