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Question

At 25 C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm1 cm2 mol1 and at infinite dilution its molar conductance is 238 ohm1 cm2 mol1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

A
4.008%
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B
40.800%
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C
2.080%
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D
20.800%
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Solution

The correct option is A 4.008%
Degree of dissociation
(α)=Molar conductivity at conc.C (Acm)Molar conductivity at infinite dilution (Am)
α=9.54Ω1 cm2 mol1238Ω1 cm2 mol1=0.04008=4.008%

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