Question

plz help me guys mujhe iss question main problem ho rahi hai

Answer 1

Naphthalene balls dissappear without leaving any residue because naphthalene balls undergo sublimation in which the solid directly gets converted into gas without leaving any residue.

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Answer 2

3.a) its water vapour contents are blown away in air .. the moisture particles are taken away by the medium of air(by sublimation)
b)we can get it's smell because it's aroma is sprinkled all over the surrounding.by the air