KCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Which one of the following oxoacids of phosphorus can reduce \(\mathrm{AgNO}_3\) to metallic silver?
- A \(\mathrm{H}_3 \mathrm{PO}_2\)
- B \(\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_7\)
- C \(\mathrm{H}_4 \mathrm{P}_2 \mathrm{O}_6\)
- D \(\mathrm{H}_3 \mathrm{PO}_4\)
Answer & Solution
Correct Answer
(A) \(\mathrm{H}_3 \mathrm{PO}_2\)
Step-by-step Solution
Detailed explanation
Hypophosphorus acid \(\left(\mathrm{H}_3 \mathrm{PO}_2\right)\) is a strong
reducing agent which can effectively reduce \(\mathrm{Ag}^{+}\) ions to \(\mathrm{Ag}\) and itself gets oxidise to phosphorus acid \(\left[\mathrm{H}_3 \mathrm{PO}_3\right]\) as follows
\(\begin{aligned} 3 \mathrm{AgNO}_3+4 \mathrm{H}_3 \mathrm{PO}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow & 3 \mathrm{Ag}+4 \mathrm{H}_3 \mathrm{PO}_3 \\ & +3 \mathrm{HNO}_3\end{aligned}\)
reducing agent which can effectively reduce \(\mathrm{Ag}^{+}\) ions to \(\mathrm{Ag}\) and itself gets oxidise to phosphorus acid \(\left[\mathrm{H}_3 \mathrm{PO}_3\right]\) as follows
\(\begin{aligned} 3 \mathrm{AgNO}_3+4 \mathrm{H}_3 \mathrm{PO}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow & 3 \mathrm{Ag}+4 \mathrm{H}_3 \mathrm{PO}_3 \\ & +3 \mathrm{HNO}_3\end{aligned}\)
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