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State PCS PYQPrelims 2019

UPPCS · Question 124

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

  1. Sublimation
  2. Evaporation
  3. Diffusion
  4. Radiation
Show answer & explanation

Answer: (A) Sublimation

Explanation

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