MEDIUMMCQ SINGLEJEE Advanced ChemistryPhysical ChemistryElectrochemistryPrevious Year Questions
The equivalent conductance of M / 32 solution of a weak monobasic acid is 8.0 mho cm2 eq–1and at infinite dilution is 400 mho cm2 eq–1. The dissociation constant of this acid is [CBSE AIPMT 2010]
A.1.25 × 10-5✓ Correct
B.1.25 × 10-6
C.6.25 × 10-4
D.1.25 × 10-4
Explanation
Given, concentration, C = M 1 32 32 Degree of dissociation C m m 8 ( ) 400 =0.02 For a weak electrolyte, dissociation constant, Kc= 퐶훼2 1−훼= 1 32 × 0.02 × 0.02 [∴1 −훼≃1] = 1.25 × 10–5
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