The inter-ionic attraction
It is the intersection between the ions of the solute at low concentrations. It is not much at low concentrations the inter-ionic cone is very less, but at high concentrations it is appreciable.
fig 5.1
The negative ion is pulled to the negative pole because it is surrounded by positive charges and vice versa.The solvation of ions
This interaction is between the ions of the solute and the molecules of the solvent. Larger the interaction, greater is the solvation, lower will be the mobility of ions.
Viscosity of the medium
Interaction between the solvent molecules. The solvent-solvent interaction also lowers the mobility. More the viscosity less is the mobility.
Temperature
Ionic mobility increases with increase in temperature, thus conductance increases.
Increase in temperature also decreases solute-solute, solute-solvent and solvent-solvent interaction.