Write balanced equation for the formation of ${\mathrm{NCl}}_3$ and ${\mathrm{PCl}}_3$. Give equations for hydrolysis reactions of ${\mathrm{NCl}}_3$ and ${\mathrm{PCl}}_3$.

Complete the following chemical equation :

${\mathrm{P}}_4+8 {\mathrm{SOCl}}_2 \to$

Complete the following chemical equation :

${\mathrm{P}}_4 + {\mathrm{SO}}_2{\mathrm{Cl}}_2 \to$

Draw the structure of ${\mathrm{H}}_3{\mathrm{PO}}_2$.

Draw the structure of the following :

${\mathrm{H}}_3{\mathrm{PO}}_3$

Draw the structure of the following :

${\mathrm{H}}_3{\mathrm{PO}}_4$

Draw the structure of the following :

${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_5$