Final answer:
Kohlrausch's law of independent migration dictates that the total ionic conductance of an electrolyte is the collective result of the separate contributions of its ions, and conductivity increases with ion concentration. This is option (a) for the provided question. In contrast, Ohm's law states that current is inversely proportional to resistance.
Step-by-step explanation:
Kohlrausch's law of independent migration states that the total ionic conductance of an electrolyte is the sum of the individual contributions of its ions. This means each ion's conductance in an aqueous solution is independent of the presence of other ions. Conductivity measurements show that each ion type contributes specifically to the current that the solution conducts, regardless of other ions in the solution. Moreover, as the concentration of ions increases, so does the conductivity of the solution, which can be demonstrated through experiments that measure electrical current flow or observe the brightness of a light bulb in the circuit.
Answering the specific question, the correct option is (a) The total ionic conductance of an electrolyte is the sum of the individual contributions of its ions.
In terms of Ohm's law, which relates current and resistance, the correct answer is that current is inversely proportional to the resistance, meaning that as resistance increases, current decreases, and vice versa.