At 298 K the molar conductivities at infinite dilution ∧ m o of N H 4 C l , K O H and K C l are 152.8, 272.6 and 149.8 S c m 2 m o l - 1 respectively. The ∧ m o of N H 4 O H in S c m 2 m o l - 1 and % dissociation of 0.01 M N H 4 O H with ∧

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At 298 K the molar conductivities at infinite dilution ∧ m o of N H 4 C l , K O H and K C l are 152.8, 272.6 and 149.8 S c m 2 m o l - 1 respectively. The ∧ m o of N H 4 O H in S c m 2 m o l - 1 and % dissociation of 0.01 M N H 4 O H with ∧ m = 25.1 S c m 2 m o l - 1 at the same temperature are

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Correct answer: B. 275.6, 9.1

∧ m o N H 4 O H = ∧ m o N H 4 C l + K O H - ∧ m o K C l = 152.8 + 272.6 - 149.8 = 275.6 S c m 2 m o l - 1 Degree of dissociation α = ∧ m ∧ m o = 25.1 275.6 = 0.091 ∴ % degree of dissociation = 9.1%

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