JEE Main · 2023 · 15 Apr 2023 · Shift 1 · Redox Reactions and Electrochemistry

Conductivity depends on the number of current-carrying ions per unit volume, and on dilution this number falls, so conductivity decreases with decreasing concentration for both strong and weak electrolytes; this statement is correct. The number of ions per unit volume therefore decreases, not increases, on dilution, so that statement is incorrect. Molar conductivity, however, increases as the concentration decreases, because the same quantity of electrolyte is spread through a larger volume; this statement is correct. The way molar conductivity varies with concentration differs for the two classes, rising gently and nearly linearly for strong electrolytes but steeply for weak ones, so that statement is correct. For weak electrolytes the increase in molar conductivity on dilution is due to an increase, not a decrease, in the degree of dissociation, so that statement is incorrect. The number of correct statements is 3.