Q. Consider the following substances:
  1. Iodine
  2. Napthalene
  3. Camphor
Which of the above substances undergo ‘sublimation’ on heating?

Answer: All of them
Notes: Sublimation is the process where a solid turns directly into a gas without passing through the liquid phase. All three substances can undergo sublimation upon heating, making the correct answer "All of them."

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