Which form of phosphorus is thermodynamically most stable?

In the following reaction,identify the nature of the product formed by the underlined atom upon complete hydrolysis at $R.T$.:
$H_4\underline{P}_2O_8 + H_2O \longrightarrow H_3PO_4 + H_2O_2$

What are the number of $P - O - P$ bridges in phosphorus pentoxide and phosphorus trioxide,respectively?

Why are pentahalides of $P$,$As$,$Sb$,and $Bi$ more covalent than their trihalides?

Which of the following nitrogen trihalides is the weakest base?

White phosphorus reacts with thionyl chloride to form $PCl_3$ along with $A$ and $B$. $A$ and $B$ respectively are