Q96 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Physical Chemistry · Chapter: Electrochemistry · Topic: Conductance · Marks: 2 · Difficulty: Medium

The limiting molar conductivities of $\mathrm{NaCl}, \mathrm{NaI}$ and RbI are $12.7,10.8$ and $9.1 \mathrm{mS} \mathrm{m}^{2} \mathrm{mol}^{-1}$, respectively. The limiting molar conductivity of RbCl would be
(a)$32.6 \mathrm{mS} \mathrm{m}^{2} \mathrm{mol}^{-1}$
(b)$7.2 \mathrm{mS} \mathrm{m}^{2} \mathrm{mol}^{-1}$
(c)$14.4 \mathrm{mS} \mathrm{m}^{2} \mathrm{mol}^{-1}$
(d)$11.0 \mathrm{mS} \mathrm{m}^{2} \mathrm{mol}^{-1}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Λ°(RbCl) = 12.7 − 10.8 + 9.1 = 11.0 mS m² mol⁻¹ (d).

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