The P Block Elements - Result Question 3
####3. Which of the following oxoacids of phosphorus has strongest reducing property?
[NEET Odisha 2019]
(a) $H_3 PO_4$
(b) $H_4 P_2 O_7$
(c) $H_3 PO_3$
(d) $H_3 PO_2$
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Solution:
- (d) Hypophosphorous acid is a good reducing agent as it contains two $P-H$ bonds.
$ \begin{aligned} & 4 AgNO_3+2 H_2 O+ H_3 PO_2 \longrightarrow \\ & 4 Ag+4 HNO_3+H_3 PO_4 \end{aligned} $
$ \begin{matrix} +5 & +2 & 0 & -3 \end{matrix} $
