Subject: Physical Chemistry · Chapter: Electrochemistry · Topic: Electrochemistry – General · Exam: NET JUNE 2011 · Marks: 2 · Difficulty: Medium
Debey-Hückel screening length $\left(\kappa^{-1}\right)$ is a measure of size of diffuse ion cloud around an ion, provided $\sqrt{\frac{2 e^{2} N_{A}}{\varepsilon_{0} k_{B} T}} \approx 30\left(\mathrm{nm} \sqrt{\text { molkg }^{-1}}\right)^{-1}$ at 298 K , which of the following values of $\kappa^{-1}$ is true for a 0.03 molal solution for $\mathrm{Na}_{2} \mathrm{SO}_{4}$ in water $\left(\varepsilon_{r} \approx 100\right)$ ?