Question

how does molar conductivity and conductivity vary with concentration?

Answer 1

The conductivity of a solution increases with the increase in concentration because the number of ions increases with the increase in concentration.

The molar conductivity of a strong electrolyte increases with decrease in concentration or dilution because the number of ions increases with dilution due to less ion-ion interactions.

The molar conductivity of a weak electrolyte increases with dilution or decrease in concentration because the degree of dissociation of weak electrolyte increases with dilution.