What is the reason that water at 0°C possesses more energy than ice at the same temperature?

The correct option is

Water particles have absorbed extra energy in the form of latent heat of fusion.

Explanation

The phenomenon described is governed by the concept of Latent Heat of Fusion. This is the amount of heat energy required to change a substance from a solid state to a liquid state at its melting point, without any change in temperature.

Detailed Analysis:

• Water particles move faster than ice particles due to lower density. is incorrect: While particles in a liquid state generally possess more kinetic energy and freedom of movement than in a solid state, the specific reason for the energy difference at the exact phase transition temperature (0°C) is the absorption of heat energy used to break the lattice structure, not merely density differences.
• Water particles have absorbed extra energy in the form of latent heat of fusion. is correct: During the phase change from ice to water, heat is supplied to the system. This heat energy is not used to increase the kinetic energy (temperature) of the particles but is utilized to overcome the strong intermolecular forces of attraction holding the ice crystal together. This absorbed energy is stored as potential energy in the water particles. Consequently, water at 0°C contains this additional "hidden" energy, known as the latent heat of fusion, which ice at 0°C lacks.
• Ice particles lose energy to the surroundings to maintain the solid state. is incorrect: Ice does not actively lose energy to maintain its state; rather, energy must be removed from water to form ice.
• Water is a liquid and naturally has higher thermal conductivity. is incorrect: Thermal conductivity refers to the rate at which a material transfers heat. It is a transport property and does not explain the difference in internal energy content between the two phases at the same temperature.

Key Takeaway:

Particles in liquid water at 0°C possess more energy than particles in ice at the same temperature because the water particles have absorbed latent heat of fusion to break the inter-particle attraction forces of the solid state.