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Matter in Our Surroundings — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceMatter in Our Surroundings2 Marks
Question
Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
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Answer

Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas takes place easily. Thus, naphthalene balls disappear with time without leaving any solid.

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