Question

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Answer 1

Answer:

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Answer 2

Answer:

Ans 3- During the change of state, the substance converts itself from one physical state to another.

When it is being converted, the energy supplied (called latent heat) is utilized to break the forces of attraction between the particles and change the state. This is why the temperature of the substance remains constant.

Ans 4- The physical state of matter is defined by the spaces between its particles. The gases have maximum spaces between them while the liquids have comparatively lower space. Hence the gases can be liquiefied by reducing the gap between the particles. This can be done either by reducing the temperature or increasing the pressure.

Explanation:

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