Can gas to solid be called sublimation ? Justify with reason

1.	Can gas to solid be called sublimation ? Justify with reason
Answer» Thanks The reverse process of sublimation is\xa0deposition\xa0or desublimation, in which a substance passes directly from a gas to a solid phase.\xa0Sublimation has also been used as a generic term to describe a solid-to-gas transition (sublimation) followed by a gas-to-solid transition (deposition).\xa0While a transition from liquid to gas is described as\xa0evaporation\xa0if it occurs below the boiling point of the liquid, and as\xa0boiling\xa0if it occurs at the boiling point, there is no such distinction within the solid-to-gas transition, which is always described as sublimation.The term\xa0sublimation\xa0refers to a\xa0physical change\xa0of\xa0state\xa0and is not used to describe the transformation of a solid to a gas in a chemical reaction. For example, the dissociation on heating of solid\xa0ammonium chloride\xa0into hydrogen chloride and ammonia is\xa0not\xa0sublimation but a chemical reaction. Similarly the combustion of candles, containing\xa0paraffin wax, to\xa0carbon dioxide\xa0and\xa0water vapor\xa0is\xa0not\xa0sublimation but a chemical reaction with oxygen.Sublimation is caused by the absorption of heat which provides enough energy for some molecules to overcome the\xa0attractive forces\xa0of their neighbors and escape into the vapor phase. Since the process requires additional energy, it is an\xa0endothermic\xa0change.\xa0

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