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Resistance of 0.2M solution of an electrolyte is 50Ω. The specific conductance of the solution is 1.4 S m−1. The resistance of 0.5M solution of the same electrolyte is 280Ω. The molar conductivity of 0.5M solution of the electrolyte in S m2 mol−1 is:

1. 5 × 10−3
2. 5 × 10−3
3. 5 × 10−2
4. 5 × 10−4

Correct answer: 5 × 10−4

Solution

The molar conductivity is calculated using the formula that relates resistance, specific conductance, and concentration. Given the resistance and specific conductance of the 0.5M solution, the molar conductivity can be derived, confirming that the correct answer is 5 × 10−4 S m² mol−1.

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