COMEDK · Chemistry · 18. Electrochemistry

Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: For strong electrolytes the plot of Molar conductivity versus Concentration gives a straight line with slope equal to +A and intercept equal to \(\lambda_{\mathrm{m}}\).
Reason: For strong electrolytes, \(\lambda_{\mathrm{m}}\) increases slowly with dilution due to increase in the distance between the ions and increase in ionic mobility

A Both Assertion and Reason are incorrect.
B Assertion is correct but Reason is incorrect.
C Assertion is incorrect but Reason is correct.
D Both Assertion and Reason are correct.

Verified Solution

Answer & Solution

Correct Answer

(C) Assertion is incorrect but Reason is correct.

Step-by-step Solution

Detailed explanation

The molar conductivity \(\lambda_{m}\) of a strong electrolyte varies with concentration \(C\) according to the Kohlrausch equation: \(\lambda_{m} = \lambda_{m}^{\circ} - A\sqrt{C}\), where \(\lambda_{m}^{\circ}\) is the molar conductivity at infinite dilution and \(A\) is a…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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