Identify the process that takes place during line segment ST of the heating curve

Melting

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Sublimation

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Evaporation

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Vaporisation

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Solution

The correct option is D Vaporisation
The initial state of the substance is solid.
As the heat is supplies to the substance it reaches its melting point.
Thus $P Q$ represents the solid state.
On further heating it changes its state to liquid by overcoming the latent heat of fusion.
Thus $R S$ represents the liquid state
As the liquid reaches its boiling point temperature (point $S$ ) it changes its state by overcoming the latent heat of vaporisation and changes to gaseous state.
Thus $S T$ represents Vaporisation.

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