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Question

Give a reason for the following observation.

Naphthalene balls disappear with time without leaving any solid.


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Solution

Sublimation:

  • The process of conversion of solid into gaseous form directly without undergoing any change into liquid form is called sublimation.
  • Example: Naphthalene balls.
  • The principle involved is sublimation.
  • Naphthalene balls are in solid-state.
  • When they are left in a place uncovered, they undergo sublimation where it is directly converted to vapors (gas) without the intervention of a liquid state.
  • They will be disappeared after days when they are uncovered.

Therefore, Naphthalene balls undergo sublimation so they disappear with time without leaving any solid.


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