A sample of substances like camphor, naphthalene or dry ice disappears after some time when exposed to air. This phenomenon is called

উত্তর দেখান ও ব্যাখ্যা

উত্তর: (A) Sublimation

ব্যাখ্যা

Sublimation is the direct change from solid to vapour without melting, as seen in camphor, naphthalene and dry ice (solid CO2).