Chemistry

Question Analysis
This question involves predicting phase transitions on a phase diagram for a typical substance when pressure is increased at constant temperature.
The main focus is on understanding how pressure changes affect phase stability for substances with a positive solid-liquid boundary slope.

Key Concept Explanation
For typical substances (non-water), the solid phase is the most dense, followed by liquid, then gas.
Increasing pressure at constant temperature favors the denser phase.
Below the critical temperature, a gas will first condense to a liquid, then freeze to a solid as pressure continues to rise.

Step-by-Step Solution
1. Recall phase density order for typical substances: Solid > Liquid > Gas.
2. Recall the effect of pressure: Higher pressure favors denser phases.
3. Analyze the transition sequence with increasing pressure (constant T < critical T):
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