MHT CET202619 April 2026Evening ShiftChemistryElectrochemistryActual
What is molar conductivity of CH ₃ COOH at zero concentration if the molar conductivities of H ₂ SO ₄ , K ₂ SO ₄ and CH ₃ COOK at zero concentrations are respectively x, y and z ⁻¹ cm ^2 mol ⁻¹ ?
Options
- A(x - y) 2 + z
- B(x - y + 2z)
- C(x + y - z)
- D(x - y) 2 + 2z
Correct answer
A. (x - y) 2 + z
Step-by-step solution
By Kohlrausch's law of independent migration of ions: ^ _m(H₂SO₄) = 2 ^ (H^+) + ^ (SO₄²⁻) = x ^ _m(K₂SO₄) = 2 ^ (K^+) + ^ (SO₄²⁻) = y ^ _m(CH₃COOK) = ^ (CH₃COO^-) + ^ (K^+) = z The molar conductivity of CH₃COOH at zero concentration is: ^ _m(CH₃COOH) = ^ (CH₃COO^-) + ^ (H^+) Subtracting the second equation from the first: x - y = 2 ^ (H^+) - 2 ^ (K^+) x - y 2 = ^ (H^+) - ^ (K^+) Adding this to the third equation: x - y 2 + z = [ ^ (H^+) - ^ (K^+)] + [ ^ (CH₃COO^-) + ^ (K^+)] x - y 2 + z = ^ (CH₃COO^-) + ^ (H^+) The