At the critical point of a substance____________?
Correct answer: D. All A, B. and C
- A. The surface tension vanishes
- B. Liquid and vapour have the same density
- C. There is no distinction between liquid and vapour phases
- D. All A, B. and C
Explanation
At the critical point, liquid and vapour densities become equal, surface tension vanishes, and the two phases lose their distinct boundary. Therefore all three statements describe the critical state.
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