Chemistry

Question Analysis
This question evaluates the understanding of the critical point in a phase diagram and its significance.

Key Concept Explanation
The critical point in a phase diagram is the highest temperature and pressure at which a substance can exist as a liquid and a gas. Beyond this point, the substance becomes a supercritical fluid, where the distinction between liquid and gas phases disappears.

Step-by-step Solution
1. Identify the definition of the critical point: It is the point beyond which a substance cannot be liquefied, and the distinction between liquid and gas phases is lost.
2. Match this definition to the given ...