When water is converted into ice ,it's volume expand about 10percent in comparison to the volume of water.Thus, ice occupies more space.As a result it's density decreases and it float on water.

Density of Ice at its Melting Point

The density of ice is an important property to understand because it affects various natural phenomena, such as the floating of icebergs and the expansion of water upon freezing. At its melting point, the density of ice is less than the density of water. The correct answer is option 'D'.

Density is defined as the mass of a substance divided by its volume. It is a measure of how much mass is contained within a given volume. In the case of water, the density is typically measured in kilograms per cubic meter (kg/m^3).

At its melting point, ice undergoes a phase change from a solid to a liquid. This phase change is accompanied by an increase in temperature. However, despite the increase in temperature, the density of ice decreases.

The reason for this decrease in density lies in the unique structure of the water molecule. Water molecules are polar, meaning they have positive and negative charges that attract each other. In its solid state, the water molecules arrange themselves in a lattice structure held together by hydrogen bonds. This structure creates open spaces between the molecules, resulting in a lower density compared to the liquid state.

When ice melts, the hydrogen bonds between water molecules are broken, and the molecules become more mobile. This increased mobility allows the water molecules to pack more closely together, resulting in a higher density. Therefore, the density of water is greater than the density of ice.

It is important to note that this decrease in density upon melting is not a common property among all substances. Most substances have a higher density in their solid state compared to their liquid state. This unique behavior of water is one of the reasons why ice floats on water.

In summary, at its melting point, the density of ice is less than the density of water. This is due to the unique structure of water molecules and the rearrangement of these molecules upon melting. Understanding the density of ice is crucial for understanding various natural phenomena and the behavior of water in different states.