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Q.

At 298 K, molar conductance of 0.1 M weak monoacidic base, BOH is $39.6 m h o . c m^{2} . m o l e^{- 1}$ . Molar conductance of BOH at infinite dilution is $396 m h o . c m^{2} . m o l e^{- 1}$ . $P^{H}$ of centi molar solution of BOH is

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a

12

b

10.699

c

11

d

9.301

answer is C.

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Detailed Solution

$α = \frac{λ_{c}}{λ_{\infty}} = \frac{39.6}{396} = 0.1$

${[O H]}^{-} = C . α$

= 0.1 x 0.1

= $10^{- 2}$

POH = - log [OH^-]

= 2

PH = 12

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At 298 K, molar conductance of 0.1 M weak monoacidic base, BOH is 39.6 mho.cm2.mole−1. Molar conductance of BOH at infinite dilution is 396 mho.cm2.mole−1. PH of centi molar solution of BOH is