Which of the following statements is true of the critical

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Which of the following statements is true of the critical temperature of a pure substance?

1. The critical temperature is the temperature above which the liquid phase of a pure substance can exist
2. The critical temperature is the temperature above which the liquid phase of a pure substance cannot exist
3. The critical temperature is the temperature below which the liquid phase of a pure substance cannot exist
4. The critical temperature is the temperature at which all three phases can coexist

Correct Option: B

NA