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JEE Advanced levelSingle correct optionDifficulty 3 of 3rg095

Which of the following changes occurs when a liquid in a sealed tube is heated to its critical temperature?

  1. AThe liquid boils vigorously and all of it becomes vapour
  2. BThe meniscus separating liquid and vapour disappears
  3. CThe vapour pressure becomes zero
  4. DThe liquid density becomes zero

Answer: B

On heating, the liquid expands and the vapour becomes denser until at the two densities become equal and the boundary (meniscus) vanishes. The substance is then a single supercritical fluid with a finite density equal to the critical density.
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