(i) Draw the structure of phosphinic acid (H_3PO_2).
(ii) Write a chemical reaction for its use as reducing agent.
(i) Phosphinic acid, H_3PO_2.
(ii) H_3PO_2 reduces Ag^+ ion to Ag which shows its reducing nature.
H _3 PO _2+4 AgNO _3+2 H _2 O \longrightarrow 4 Ag +4 HNO _3+ H _3 PO _4