Question

Give reason for the given observations. Naphthalene balls disappear with time without leaving any solid.

Answer 1

Answer: (a) Naphthalene ballsundergo sublimation due to which it converts directly into vapours anddisappear into air without leaving any solid. (b) The particles of perfume diffuse rapidly into the air and its smell can be felt while sitting several metres away.

Answer 2

Dear Student,

● Explaination -

• Naphthalene has a property to undergo sublimation. i.e. direct transition from solid to gas state.
• Hence, naphthalene balls disappear with time without leaving any solid.

● Extra information -

• Transition of substance from solid phase to gas phase without passing through liquid phase is called sublimation.
• Substances that undergo sublimation are - dry ice, napthalene (moth balls), solid iodine, wax, ammonium chloride.

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