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Q.

 At T(K) the molar ionic conductivities of NH4+ and OH– at infinite dilution are 72 and 198S cm2 mol–1 respectively. The molar conductivity of 0.01M NH4OH solution at the same temperature is found to be 9S cm2 mol–1. The
percentage dissociation of NH4OH at this concentration is

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a

3.33

b

7.14

c

12.5

d

 4.54

answer is A.

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Detailed Solution

We know that,

∧m0(NH4​OH)=λNH4+0 + λOH-0

Substitute the given values in above equation,
=72+198=270ohm−1cm2
α=∧mC∧m0=9270=130=3.33%

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