Question

One of the acid listed below is formed from $P_2O_3$ and the rest are formed from $P_2O_5$. The acidformed from phosphorus (III) oxide is

• A. $HPO_3$
• B. $H_4P_2O_7$
• C. $H_3PO_4$
• D. $H_3PO_3$

Answer 1

Answer: (D)

$H_3PO_3$

Answer 2

{ 2P_2O_3 +\underset{\mathrm{Cold}}{ {6H_2O}} -> 4H_3PO_3}