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(A) $(1)$ Sublimation: It is the purification technique based on the principle that on heating,some solid substances change from solid to vapour state

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Sublimation

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(A) $(1)$ Sublimation: It is the purification technique based on the principle that on heating,some solid substances change from solid to vapour state without passing through the liquid state.$(2)$ Distillation: It is used to separate volatile liquids from non-volatile impurities or liquids having a sufficient difference in their boiling points.$(3)$ Chromatography: It is based on the separation of components using stationary and mobile phases.$(4)$ Crystallization: It is based on the difference in the solubilities of the compound and its impurities in a suitable solvent.

On heating,some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

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