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Q.

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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a

2.080 %

b

20.800 %

c

4.008 %

d

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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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