While ice melts at 0 °C, its temperature :

The correct option is remains same.

Explanation:

When ice at 0 °C begins to melt into liquid water, heat energy is continuously supplied to it. However, during this phase change process (melting or fusion), the temperature of the ice-water mixture does not increase; it remains same at 0 °C until all the ice has completely converted into water.

Reasoning:

1. Latent Heat of Fusion: The thermal energy supplied to the ice during melting is absorbed as latent heat of fusion. Instead of raising the kinetic energy of the molecules (which would increase temperature), this energy is utilized entirely to break or weaken the intermolecular hydrogen bonds that hold the water molecules in a fixed solid lattice structure.

2. Constant Temperature Phase Change: Since temperature is a measure of the average kinetic energy of the particles, and all added energy goes into changing the potential energy (altering the phase), the average kinetic energy remains constant. Consequently, the temperature remains unchanged at 0 °C until the transition from solid to liquid is complete.