Q.

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm−1cm2mol−1 and at infinite dilution its molar conductance is 238 ohm−1cm2mol−1  The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

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Detailed Solution

Degree of dissociationα=Molar conductivity at given conc.ΛmcMolar conductivity at infinite  dilution Λm∞% α=9.54Ω−1cm2mol−1238Ω−1cm2mol−1×100=0.04008×100=4.008%
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At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm−1cm2mol−1 and at infinite dilution its molar conductance is 238 ohm−1cm2mol−1  The degree of ionisation of ammonium hydroxide at the same concentration and temperature is