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Electrochemistry question

2021 · Q97
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Electrochemistry question

2021 · Q97

NEETChemistryElectrochemistryMCQ+4 / −1
The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol−-−1 respectively. The molar conductance of CH3COOH at infinite dilution is. Choose the right option for your answer.
  1. A
    540.48 S cm2 mol−-−1
  2. B
    201.28 S cm2 mol−-−1
  3. C
    390.71 S cm2 mol−-−1
  4. D
    698.28 S cm2 mol−-−1
View written solutionFree

Correct answer: C

According to Kohlrausch law of independent migration of ions.

Λmo(CH3COOH)\Lambda _m^o(C{H_3}COOH)Λmo​(CH3​COOH)

=Λmo(CH3COONa)+Λmo(HCl)−Λmo(NaCl) = \Lambda _m^o(C{H_3}COONa) + \Lambda _m^o(HCl) - \Lambda _m^o(NaCl)=Λmo​(CH3​COONa)+Λmo​(HCl)−Λmo​(NaCl)

= 91.0 S cm2 mol−-−1 + 426.16 S cm2 mol−-−1 −-− 126.45 S cm2 mol−-−1

= 390.71 S cm2 mol−-−1

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