Question

$P_4{O}_{10}$ undergoes complete and violent hydrolysis to give __ acid.

Answer 1

$P_4{O}_{10}$ undergoes violent hydrolysis in water to give orthophosphoric acid
$P_4{O}_{10}+6H_{2}O\to 4H_{3}P{O}_4$

On the other hand, if $P_2{O}_3$ is hydrolyzed Phosphorous acid is obtained.
$P_4{O}_6+6H_{2}O\to 4H_{3}P{O}_3$