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Question

When the solid changes into a liquid, there is no change in:


  1. Temperature

  2. Average kinetic energy of the molecules

  3. Both A and B

  4. Average distance between the molecules


Solution

The correct option is C

Both A and B


When the solid changes into a liquid, there is no change in temperature, so the average kinetic energy of the molecules does not change as it is a function of temperature, but the distance between the molecules on average increases. Some energy is required for increasing the separation between the attractive force between the molecules.

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