Question

Best reagent for the conversion of $AgNO_3$ to Ag is

• A. $HClO_4$
• B. $H_3PO_2$
• C. $HIO_4$
• D. $I_2$

Answer 1

Answer: (B)

$H_3PO_2$

Answer 2

$H_3PO_2$ is a good reducing agent as it contains two P-H bonds and thus reduces $AgNO_3$ to Ag. $4AgNO_{3 }+ H_{3}PO_{2} + 2H_{2}O \to4Ag ? + H_{3}PO_{4}+ 4HNO_{3}$