Question

Which of the following electrolytic solutions of the same electrolyte has Maximum electrolytic conductivity at the same temp?

• A. 0.2 mole of solute is dissolved in 250 ml
• B. 0.3 mol in 600 ml
• C. 0.6 in 1000 ml
• D. 0.8 mole in 2000 ml

Hint:

While molar conductivity increases with dilution, specific conductivity ($\kappa$) increases with concentration.

Answer 1

The Correct Option is A

Step 1: Concept
Specific electrolytic conductivity ($\kappa$) generally increases with the concentration of the electrolyte because the number of ions per unit volume increases.

Step 2: Meaning
We need to calculate the molarity (concentration) for each option ($M = \frac{\text{moles}}{\text{Volume in Liters}}$).

Step 3: Analysis
(A) $M = \frac{0.2}{0.250} = 0.8$ M
(B) $M = \frac{0.3}{0.600} = 0.5$ M
(C) $M = \frac{0.6}{1.000} = 0.6$ M
(D) $M = \frac{0.8}{2.000} = 0.4$ M

Step 4: Conclusion
Since option (A) has the highest concentration (0.8 M), it will have the maximum number of ions per unit volume and thus the highest electrolytic conductivity. Final Answer: (A)