EasyRe-NEET 2026
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For a salt XY, which is a strong electrolyte, the plot of Λm versus √c has a slope of −90.0 S cm² mol⁻³ᐟ² L¹ᐟ² at 298 K. At 0.01 M concentration of XY, the values of Λm is 145.S cm² mol⁻¹. The limiting molar conductivity of Y⁻ ion (λ°Y⁻, in S cm² mol⁻¹) at 298 K will be (Given : λ°X⁺ = 74.0 S cm² mol⁻¹)
A
80.0
B
100.0
C
90.0
D
76.0
Explanation
For XY, Debye Huckel Onsager equation, ΛM = Λ°M − A√c slope of ΛM vs √c is −A = −90 A = 90 At C = 0.01 M, λM = 145 ∴ 145 = Λ°M − 90 × √10⁻² 145 = Λ°M − 9 Λ°M = 154 Scm²mol⁻¹ Λ°M (XY) = Λ°M (X⁺) + Λ°M(Y) 154 = 74 + Λ°M(Y) Λ°M(Y) = 154 − 74 = 80 Scm² mol⁻¹
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