Water is different from other substances
because:
a it is more dense as a solid than a liquid
b it is less dense as a solid than liquid
c it is more dense as a gas than a liquid
d it is less dense as a solid than a gas

Option (b) is the correct answer.

Explanation:

It is known that density is the amount of mass divided by volume.

When water is present in solid state that is, in the form of ice then its molecules arrange themselves in a rigid tetrahedral structure.

Due to this there will cage like spaces between the molecules of ice during the bonding. As a result, they occupy more volume and it is known that density is inversely proportional to volume.

Hence, ice has low density as compared to liquid state of water.

When water is present in liquid state, then its molecules are closer to each other and they are able to slide past each other. Hence, space between them is less therefore, lesser will be its volume.

As a result, liquid state of water will have more density.

Thus, we can conclude that water is different from other substances  because it is less dense as a solid than liquid.

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