At 25oC, molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 Ω-1 cm2 mol-1and at infinite dilution, its molar conductance is 238 ohm-1cm2 mol-1. The degree of ionisation of ammonium hydroxide at the same concentration a4d temperature is

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2.080 %

20.800 %

4.008 %

40.80 %

answer is C.

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Detailed Solution

Given, molar conductance at 0.1 M concentration, λc=9.54Ω−1cm2mol−1Molar conductance at infinite dilution, λc∞=238Ω−1cm2mol−1We know that, degree of ionisation, α=ΛCλ∞×100=9.54238×100=4.008%

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