Chemistry
Explain the term- 'sublimation'. Is sublimation of naphthalene - a physical or a chemical change? Give reasons.
Phy & Chem Changes
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Answer
Sublimation is the conversion of a solid directly into gaseous [vapour] state and on cooling directly back to solid state without changing into liquid state.
Sublimation of naphthalene involves change of state and no new substance is formed. Moreover, the change is reversible as naphthalene vapour condense to form solid naphthalene. Hence, it is a physical change.
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