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A closed flask contains water in all its three states solid, liquid and vapour at 0°C. In this situation, the average kinetic energy of water molecules will be:

1. the greatest in all the three states
2. the greatest in vapour state
3. the greatest in the liquid state
4. the greatest in the solid state

Correct answer: the greatest in all the three states

Solution

At 0°C, the temperature is the same for all three states of water in the closed system. Since average kinetic energy depends only on temperature, it will be the same for solid, liquid, and vapour states.

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