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A) The process is called sublimation.
The process in which the solids directly convert into gas is called sublimation.
B) Naphthalene balls , amonium chloride
C)The reason is naphthalene balls have sublimation property
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a) Sublimation: A change of state directly from solid to gas without changing into liquid state is called sublimation.
b) Example: Aluminium chloride ( camphor), dry ice(carbon dioxide), Naphthalene ball.
c) Naphthalene balls dissapear with time without leaving any any solid because it undergoes the process of sublimation. It changes to gaseous state without changing into liquid state.
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