ElectrochemistryhardMCQ SINGLE

Upon progressive dilution of an aqueous strong electrolytic solution towards infinite dilution, whicElectrochemistry Chemistry Question

Question

Upon progressive dilution of an aqueous strong electrolytic solution towards infinite dilution, which of the following accurately describes the observed thermodynamic changes in specific conductivity ($\kappa$) and molar conductivity ($\Lambda_m$)?

Answer: B

💡 Solution & Explanation

Specific conductivity ($\kappa$) is the conductance of exactly $1\text{ cm}^3$ of solution. As dilution increases, the number of current-carrying ions per unit volume strictly decreases, so $\kappa$ decreases. Molar conductivity ($\Lambda_m = \kappa \times V$) involves the total volume $V$ containing 1 mole of electrolyte. Because $V$ increases much faster than $\kappa$ decreases, the overall $\Lambda_m$ increases, aided by decreased interionic attractions.

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