Give the correct increasing order of electrical conductivity of aqueous solutions of the following complex entities :

P)$\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_4$            Q) $\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$

R) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]\mathrm{Cl}$      S) ${\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right]$                              

 

Since the electrical conductivity of aqueous solutions decreases with the number of ions.i.e 

$\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_4\Rightarrow 5$ ions,  $\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3\Rightarrow 4$ions, $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]\mathrm{Cl}\Rightarrow 2$ions, ${\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right]\Rightarrow 3$ions.

The increasing order of electrical conductivity of aqueous solutions is,

$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]\mathrm{Cl}<{\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right]<\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3<\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_4$Hence correct option is A