9. Naphthalene balls disappear with time without leaving any residue. Give reason.
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Naphthalene balls sublime i.e. directly get converted from solid to gaseous without leaving any residue
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Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.
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