what is the action of heat in iodine crystals which colours it gain
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When heated, solid iodine sublimates and enters the gas phase. Iodine got its name from the Greek word 'ἰοειδής', meaning 'purple'. Indeed, iodine vapor has a beautiful purple color. Regaining solid iodine from iodine vapor can be achieved by cooling down iodine vapor on a cold surface.
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Iodine is a dark grey crystalline solid. Iodine is very slightly soluble in water and freely soluble in organic solvents. Its melting point is 114 degree C and boiling point is 184 degree C.
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