Question

One of the acids listed below is formed from $P_2{O}_3$ and the rest are formed from $P_2{O}_5$. The acid formed from $P_2{O}_3$ :

• A. $H_{2}P{O}_3$
• B. $H_4{P}_2{O}_7$
• C. $H_{3}P{O}_4$
• D. $H_{3}P{O}_3$

Answer 1

The correct option is D $H_{3}P{O}_3$

When oxides of phosphoruos reacts with water they form oxy acids of phosphoruos.
$P_2{O}_3+3H_{2}O\to 2H_{3}P{O}_3$