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Liquid oxygen first heats up to its boiling point, then transitions into a gaseous state, followed by a further rise in temperature. Which graph represents this process?

1. Graph (a)
2. Graph (b)
3. Graph (c)
4. Graph (d)

Correct answer: Graph (a)

Solution

The process described involves heating a liquid to its boiling point, undergoing a phase change, and then heating the resulting gas. This corresponds to a graph with a plateau (constant temperature during phase change) followed by a rising slope, which matches Graph (a).

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