####13. Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus?
[1999]
(a) $H_4 P_2 O_7$
(b) $H_3 PO_2$
(c) $H_3 PO_3$
(d) $H_3 PO_4$
(a)
Pyrophosphoric acid
(b)
Hypophosphorous acid
(c) $H_3 PO_3 \quad \Rightarrow \quad \xrightarrow{\text{ II }} \xrightarrow{O}-OH$
Phosphorous acid
(d)
orthophosphoric acid
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