Question

The anhydride of ortho phosphoric acid is

• A. $P_2O_3$
• B. $P_2O_5$
• C. $P_3O_5$
• D. $P_4O_{10}$

Answer 1

Answer: (B)

$P_2O_5$

Answer 2

${P_2O_5 + 3H_2O -> 2H_3PO_4}$