Explanation
Conductivity through a solution is generallly through the ions that are present in it. Pure water is not very conductive at all, but salt water is quite conductive . Therefore the more salt or ions dissolved in solution, higher is the conductivity (within limits). As you dilute the solution , the concentration of ions goes down, and the ability to pass a current is diminished. Hence the specific conductance decreases upon dilution.
The conductivity of solution increases on dilution. Where, as the specific conductitvity decreases on dilution, as the number of ion decrease w.r.t. to volume. Therefore 0.002N solution has least specific conductance.
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