NEET 2019 Odisha · ChemistryPrevious Year Question

Which of the following oxoacids of phosphorus has the strongest reducing property?

Answer: (C) (c) $H X_{3} PO X_{2}$ . \textbf{Answer:} (c) $H X_{3} PO X_{2}$ .

A.(a) $H X_{4} P X_{2} O X_{7}$
B.(b) $H X_{3} PO X_{3}$
C.(c) $H X_{3} PO X_{2}$ ✓
D.(d) $H X_{3} PO X_{4}$

Correct Answer

Solution & Explanation

\textbf{Answer:} (c) $H X_{3} PO X_{2}$ . \textbf{Solution:} The reducing property of phosphorus oxoacids is proportional to the number of $P - H$ bonds. $H X_{3} PO X_{2}$ (hypophosphorous acid) contains the maximum number of $P - H$ bonds (two), so it is the strongest reducing agent. For comparison: $H X_{3} PO X_{3}$ has one $P - H$ bond, while $H X_{3} PO X_{4}$ and $H X_{4} P X_{2} O X_{7}$ have none.

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