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QPage 217: Q9: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Page 217: Q9 Solution: As temperature increases, the viscosity of liquids decreases…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that the resistance decrease is solely due to reduced viscosity, but the dominant effect is the increase in ion mobility with temperature. Recall that conductivity $kappa = F^2sum z_i^2 c_i mu_i$, so both concentration and mobility change, not just viscosity.

As temperature increases, the viscosity of liquids decreases considerably. Will this decrease the resistance of an electrolyte as the temperature increases?

Step-by-Step Verified Solution

**Answer:** Yes, the resistance of the electrolyte decreases as temperature increases. **Step-by-Step Explanation:** In an electrolyte, current is carried by ions. Viscosity hinders ion movement. As temperature increases, viscosity decreases, allowing ions to move more freely. Hence, the resistance decreases [citation:12].

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