Read the following short write-up and answer the questions at the end of it.

In certain polar solvents ${\mathrm{PCl}}_5$ undergoes an ionisation reaction in which ${\mathrm{Cl}}^{-}$ ion leaves one ${\mathrm{PCl}}_5$ molecule and attaches itself to another.

$2{\text{PCl}}_5\rightleftharpoons {\text{PCl}}_4^{+}+{\text{PCl}}_6^{-}$

Number of lone pairs around phosphorus in ${\mathrm{PCl}}_5,$ ${\text{PCl}}_4^{+}$ and  ${\text{PCl}}_6^{-}$ are respectively