The point at which all the three phases (solid, liquid, gas) co-exist is called:

triple point

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boiling point

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freezing point

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none of these

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Solution

The correct option is A triple point
Triple point:
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. For example, the triple point of mercury occurs at a temperature of ${- 38.8}^{0} C$ and a pressure of $0.2 m P a .$

Boiling point:
The boiling point of a substance is the temperature at which the liquid changes to vapour when temperature is increased.

Freezing point:
The freezing point of a substance is the temperature at which the liquid changes to solid when cooled.
Option A is correct.

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