Question
Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states?

Answer

Physical properties of ice, water and steam are very different because they are found in different states. Ice is found in solid, water is found in liquid and steam is found in vapour state. The chemical composition of water in all the three states (ice, water and steam) is same, i.e. $\text{H}_2\text{O}$.

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