Q.

At 298 K, molar conductance of 0.1 M weak monoacidic base (BOH) is 45 mho.cm2.mole-1. Molar conductance of BOH at infinite dilution is 450 mho.cm2.mole-1. pH of deci molar solution of BOH is

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a

11

b

11.301

c

12

d

12.699

answer is C.

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Detailed Solution

According to Kohlrausch law,Degree of ionization of BOH, α=ΛcΛ0 ; Degree of ionization of BOH, α=45450=0.1 ; OH- =Cα ; OH- =0.1×0.1=0.01 M;      pOH=2 ;        pH=12 ;
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At 298 K, molar conductance of 0.1 M weak monoacidic base (BOH) is 45 mho.cm2.mole-1. Molar conductance of BOH at infinite dilution is 450 mho.cm2.mole-1. pH of deci molar solution of BOH is