Molar conductivity Lambda_m = 90 text S cm ^2text mol ^ -1 for 0.050 text mol L ^ -1 monobasic weak acid. Degree of dissociation: [Lambda_+^circ = 349.6, Lambda_-^circ = 50.4 text S cm ^2text mol ^ -1 ]

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NEET Chemistry QUESTION #1090

Question 1

Molar conductivity \(\Lambda_m = 90\ \text{S cm}^2\text{mol}^{-1}\) for \(0.050\ \text{mol L}^{-1}\) monobasic weak acid. Degree of dissociation: [\(\Lambda_+^\circ = 349.6\), \(\Lambda_-^\circ = 50.4\ \text{S cm}^2\text{mol}^{-1}\)]

0.225✔️
0.215
0.115
0.125

Correct Answer Explanation

\(\Lambda_m^\circ = \Lambda_+^\circ + \Lambda_-^\circ = 349.6+50.4=400\ \text{S cm}^2\text{mol}^{-1}\). Degree of dissociation \(\alpha = \frac{\Lambda_m}{\Lambda_m^\circ}=\frac{90}{400}=0.225\).

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