Chemistry

Question Analysis
This question tests the student's ability to determine the phase change that occurs when a substance crosses a phase boundary on a phase diagram, specifically the solid-liquid boundary.

Key Concept Explanation
When a substance's temperature is increased and it crosses the solid-liquid boundary on a phase diagram, it undergoes a phase change from solid to liquid, known as melting.

Step-by-step Solution
1. Identify the initial conditions: temperature = , pressure = .
2. Determine the melting point at

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