Conductivity of a saturated solution of a sparingly soluble salt AB at 298K is 

1.85 × 10^–6Sm^–1. Solubility product of the salt AB at 298 K is 
$\left[\text{ given }{\mathrm{\lambda }}_{\mathrm{M}}^0\left(\mathrm{AB}\right)=1.4\times {10}^{-4}{\mathrm{Sm}}^{-2}\mathrm{mo}{1}^{-1}\right]$