Question

nephthalene balls are made up of ......,,....
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Answer 1

Answer:

Naphthalene is made from crude oil or coal tar. It is also produced when things burn, so naphthalene is found in cigarette smoke, car exhaust, and smoke from forest fires. It is used as an insecticide and pest repellent.

Answer 2

Answer:

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Nephthalene balls are made up of phthalic anhydride .

hope it will be helpful :)