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A closed vessel contains pure water, in thermal equilibrium with its vapour at $25^\circ C$(Stage$\#1$), as shown.

The vessel in this stage is then kept aside an isothermal oven which is having an atmosphere of hot air maintained at $80^\circ C$ The vessel exchanges heat with the oven atmosphere and attains a new thermal equilibrium (stage $\#2$). If the Valve $A$ is now opened inside the oven, what will happen immediately after opening the valve?

  1. Water vapor inside the vessel will come out of the Valve $A$
  2. Hot air will go inside the vessel through Valve $A$
  3. Nothing will happen – the vessel will continue to remain in equilibrium
  4. All the vapor inside the vessel will immediately condense
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