Maximum entropy will be in Water Vapours

Explanation:
Entropy is a measure of the disorder or randomness of a system. In thermodynamics, entropy is often associated with the number of possible microstates of a system. The greater the number of microstates, the higher the entropy.

Entropy and Phase Changes:
Entropy tends to increase with phase changes from solid to liquid to gas. This is because as a substance changes phase, the number of microstates increases, leading to a greater disorder or randomness in the system.

Maximum Entropy in Water Vapours:
Water vapours refer to the gaseous state of water. In this state, water molecules are highly disordered and have the highest number of possible microstates. This high degree of disorder leads to maximum entropy in water vapours.

Entropy in Ice:
Ice refers to the solid state of water. While ice molecules are arranged in a more ordered structure compared to water vapours, the number of possible microstates is lower. Therefore, the entropy of ice is lower than that of water vapours.

Entropy in Liquid Water:
Liquid water is in a state between a solid and a gas. The molecules in liquid water are more disordered compared to ice but less disordered compared to water vapours. Therefore, the entropy of liquid water is higher than that of ice but lower than that of water vapours.

Entropy in Snow:
Snow is another form of solid water, similar to ice. It has a more ordered structure compared to liquid water but less ordered compared to ice. Therefore, the entropy of snow is lower than that of liquid water but higher than that of ice.

Conclusion:
Based on the understanding of entropy and phase changes, it can be concluded that water vapours have the maximum entropy among the given options (ice, liquid water, snow, and water vapours).