Practice question

Given: What is the molar conductivity at infinite dilution for CaCl₂ if the ionic molar conductivities of Ca²⁺ and Cl⁻ are 119.0 S cm² mol⁻¹ and 76.3 S cm² mol⁻¹ respectively? These values define the system as per NCERT data. Formula: According to Kohlrausch’s law, Lambda_m⁰ = lambda_{Ca^{2+⁰ + 2lambda_{Cl^{-⁰. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Lambda_m⁰ = 119.0 + 2 × 76.3 = 119.0 + 152.6 = 271.6 S cm² mol^{-1 . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.