Question

1. Give reason
reason folk the following
a Naphtheline balls disappear to with time
without having any solid ?
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Answer 1

Explanation:

napthalene undergoes sublimation,a change of state of napthalene from solid to gas without leaving any liquid.

hence napthalene balls keep on forming napthalene vapours which disappear into the air with time without leaving any solid and thus making the surroundings cool.

hope it is useful..