AP EAMCET · Chemistry · Electrochemistry

The molar conductivities of \(\mathrm{KCl}, \mathrm{NaCl}\) and \(\mathrm{KNO}_3\) are 100,120 and \(90 \mathrm{~cm}^2 \mathrm{~mol}^{-1}\),
respectively. The molar conductivity of \(\mathrm{NaNO}_3\) would be .......... cm \(\mathrm{mol}^{-1}\).

A 110
B 290
C 310
D 120

Verified Solution

Answer & Solution

Correct Answer

(A) 110

Step-by-step Solution

Detailed explanation

molar conductivity \(\Lambda_{\mathrm{m}}^{\circ}\) According to Kohlrausch law,

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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The molar conductivities of \(\mathrm{KCl}, \mathrm{NaCl}\) and \(\mathrm{KNO}_3\) are 100,120 and \(90 \mathrm{~cm}^2 \mathrm{~mol}^{-1}\),respectively. The molar conductivity of \(\mathrm{NaNO}_3\) would be .......... cm \(\mathrm{mol}^{-1}\).

Step-by-step Solution

The molar conductivities of \(\mathrm{KCl}, \mathrm{NaCl}\) and \(\mathrm{KNO}_3\) are 100,120 and \(90 \mathrm{~cm}^2 \mathrm{~mol}^{-1}\),
respectively. The molar conductivity of \(\mathrm{NaNO}_3\) would be .......... cm \(\mathrm{mol}^{-1}\).