The purification method based on the following physical transformation is :

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Step 1: Identify the Physical Transformation

The diagram shows the sequence: Solid → (on heating) → Vapour → (on cooling) → Solid

This is a direct solid ↔ vapour transition with no liquid phase involved at any stage.

Step 2: Identify the Purification Technique

This is Sublimation — the process in which a solid directly converts to vapour on heating, and the vapour directly converts back to solid on cooling, completely bypassing the liquid state.

Step 3: Compare with Other Techniques

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