Q.

Plotting  1/m against cm  for aqueous solutions of a monobasic weak acid (HX) resulted in a straight line with y-axis intercept of P and slope of S. The ratio P/S is  
[m= molar conductivity
m0= limiting molar conductivity
c = molar concentration
 Ka= dissociation constant of HX] 

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a

Kam0

b

1/Kam0

c

2Kam0

d

Kam0/2

answer is A.

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Detailed Solution

detailed_solution_thumbnail

m=Ka=21α
Ka=cmm021mm0
KaKa.mm0=cmm02

1m=cmKa.m02+1m0KamKam0=cmm02+1m0
S=1Ka.m02
P=1m0
PS=1m0×Ka.m02
=Ka.m0

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