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Chemistry · PYQ NEET UG 2025
हिन्दीIf the molar conductivity \( (\Lambda_m) \) of a \( 0.050\text{ mol L}^{-1} \) solution of a monobasic weak acid is \( 90\text{ S cm}^2\text{ mol}^{-1} \), its extent (degree) of dissociation will be \( [ \text{Assume } \Lambda^\circ_+ = 349.6\text{ S cm}^2\text{ mol}^{-1} \text{ and } \Lambda^\circ_- = 50.4\text{ S cm}^2\text{ mol}^{-1}. \)]
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Correct answer · Option C
0.225
Explanation
\( \Lambda^\circ_m = \Lambda^\circ_+ + \Lambda^\circ_- = 349.6 + 50.4 = 400\text{ S cm}^2\text{ mol}^{-1} \). Degree of dissociation \( \alpha = \frac{\Lambda_m}{\Lambda^\circ_m} = \frac{90}{400} = 0.225 \).
