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Question

At 25∘ C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm−1 cm2 mol−1 and at infinite dilution its molar conductance is 238 ohm−1 cm2 mol−1. 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 (A∞m) α=9.54Ω−1 cm2 mol−1238Ω−1 cm2 mol−1=0.04008=4.008%

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