As the temperature rises, the viscosity of a liquid

  • A. increases
  • B. decreases
  • C. stays the same
  • D. becomes zero

Explanation

Heating gives the molecules enough energy to slip past one another more easily, weakening the intermolecular attractions that resist flow, which is why warm honey pours readily. Gases behave in the opposite way: their viscosity rises with temperature because it comes from molecular collisions rather than cohesion. Confusing the two cases is the usual mistake.

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