Best Answer

because it sublimes in the air.

in easier language

it dissolved n air easily

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Q: Why does the size of naphthalene balls reduce if it is kept in open?
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Why napthalene balls disappear if kept in air for a week?

Naphthalene balls sublimate when exposed to air, meaning they transform from a solid directly into a gas. This process occurs due to the low vapor pressure of naphthalene, causing it to evaporate quickly in open air without leaving residue behind.

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Because it sublimes (changes directly from a solid to a vapor) at room temperature. naphthalene balls are vaporisable substance so they easily turn into vapor , they can turn into vapor because the intermolecular force is very weak so it easily vaporises to gas

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