The point at which all the three phases – solid, liquid, and vapour co-exist in equilibrium in a p-T diagram is known as ________.

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  1. boiling point
  2. triple point
  3. melting point
  4. critical point

Answer (Detailed Solution Below)

Option 2 : triple point
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CONCEPT:

  • The Triple point is a point on the PT diagram where all the three phases solid, liquid, and gases co-exist in equilibrium.
  • At a pressure below the triple point line, the substance cannot exist in the liquid phase, and the substance when heated, transforms from solid to vapour by absorbing the latent heat of sublimation from the surroundings.

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