Which of the following conditions represents an equilibrium?
Freezing of ice in a open vessel at constant temperature
Few drops of water are present along with air in a balloon at constant temperature
Water is boiling in an open vessel at constant temperature
Decompostion of CaCO3 in an open container
Equilibrium can be established only in closed containers.
It is not possible for an equilibrium to be established in an open container as the products of the reaction of the components of the equilibrium can escape out into the atmosphere.
Hence, out of the given options, equilibrium can only be established in the balloon between water droplets and water vapors.
Therefore, Option (2) is correct.
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