**Conductivity** $\kappa$ of a solution refers to:
AConductance of 1 mole of electrolyte in solution
BConductance of a 1 m³ cube
CResistance of any volume of solution
DConductance of a unit-length, unit-area cube of solution
Answer & Solution
Correct answer: D. Conductance of a unit-length, unit-area cube of solution
Conductivity is the conductance of a conductor of **unit length and unit cross-sectional area** (a unit cube). Units: S m⁻¹ (SI) or Ω⁻¹ cm⁻¹.
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