Question

give reason camphor dissappearif kept in open air for few days

Answer 1

Camphor is a sublime substance. On heating, it directly changes into gaseous state without being a liquid. This process is known as sublimation. If camphor is kept in open for a few days, because of heating, it will directly change into gas and thus 'disappears'.
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Answer 2

CAMPHOR UNDERGOES SUBLIMATION WHEN IT ABSORBS HEAT FROM THE ATMOSPHERE AND CHANGES DIRECTLY FROM SOLID TO GASEOUS STATE.