AIPMT MAINS2012Chemistry-Electrochemistry
AIPMT MAINS 2012 Chemistry Kohlrausch's Law MCQ Question
Type: MCQ-numerical-Medium-Class 12
Molar conductivities (Λ°) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol⁻¹ respectively. Λ° for CH₃COOH will be:
A
425.5 S cm² mol⁻¹
B
180.5 S cm² mol⁻¹
C
290.8 S cm² mol⁻¹
D
390.5 S cm² mol⁻¹
Correct Answer
Option D
Detailed Explanation
Using Kohlrausch's law of independent migration of ions, Λ°_m = Λ°_CH₃COONa + Λ°_HCl - Λ°_NaCl = 91 + 425.9 - 126.4 = 390.5 S cm² mol⁻¹.
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