What do you mean by equivalent conductivity?

Hint: Try to recall the definition of conductivity that has been discussed in the chapter electrochemistry chapter. Equivalent conductance of an electrolyte is defined as the conductance of a volume of solution containing one equivalent weight of dissolved substance when placed between two electrodes that are parallel and 1cm apart. Specific equivalent conductance is known as equivalent conductivity.

Complete answer:
Conductivity is the measure of the ease at which an electric charge can pass through a material or aqueous solution containing ions.
Equivalent conductivity is the specific conductance of an aqueous solution containing one equivalent weight of electrolyte dissolved in the solution. Hence it is defined as the conducting power of all the ions produced by dissolving one-gram equivalent of an electrolyte in solution.

Therefore, the correct answer is option (A).

Note:
Equivalent conductance at infinite dilution is given by Kohlrausch's law. The law states that conductivity of ions is constant at infinite dilution and does not depend on the respective ions present in the solution. This law is used to calculate conductance of weak electrolytes that are considered to dissociate at infinite dilution.