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Which mechanism causes increased viscosity in motor oil at low temperatures?

A)Van der Waals intermolecular attraction
B)Increased ionic conductivity
C)Phase transition to solid
D)Reduced hydrogen bond formations

💡 Explanation

Reduced kinetic energy allows the Van der Waals intermolecular attraction mechanism to dominate between oil molecules, increasing viscosity when they move closer; therefore, the oil thickens rather than remaining fluid due to rapid molecular motion at higher temperatures.

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