Draw the structure of the following :

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

Draw the structure of the following :

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

Draw the structure of ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_7$.

Draw the structure of $({\mathrm{HPO}}_3{)}_3$.

Arrange the following in the increasing order of property mentioned :

${\mathrm{H}}_3{\mathrm{PO}}_3, {\mathrm{H}}_3{\mathrm{PO}}_4, {\mathrm{H}}_3{\mathrm{PO}}_2$ (Reducing character)

Arrange the following in the increasing order of property mentioned :

${\mathrm{NH}}_3, {\mathrm{PH}}_3, {\mathrm{AsH}}_3, {\mathrm{SbH}}_3, {\mathrm{BiH}}_3$ (Base strength)