Molar ionic conductivities of divalent cation and anion are 57\ S\ cm2\ mol-1 and 73\ S\ cm2\ mol-1 respectively. The…
Electrochemistry · Class 12 · JEE Main Previous Year Question
Molar ionic conductivities of divalent cation and anion are and respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be:
- a
- b
- c✓
- d
Strategy: Apply Kohlrausch's Law of independent migration of ions. The molar conductivity of an electrolyte is the sum of the products of molar ionic conductivities and their respective stoichiometric coefficients.
Step 1: Determine the formula An electrolyte with a divalent cation () and a divalent anion () has the formula . Stoichiometric coefficients: , .
Step 2: Calculate
u_+ \lambda^\circ_+ + u_- \lambda^\circ_-$$ $$\Lambda_m = 1(57) + 1(73) = 130 \mathrm{S cm^2 mol^{-1}}$$ $$\boxed{\text{Answer: (c) } 130 \mathrm{S\ cm^2\ mol^{-1}}}$$Practice this question with progress tracking
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