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When we perform sublimation activity using camphor it converts into gas but why it solidifies on the sides of the funnel . Please Please answer this experts it is urgent

Dear student,

A change of state directly from solid to gas without changing into liquid state (or vice versa) is observed, this phenomenon is called sublimation.
its a reversible process.

Camphor is the molecule which on heating changes directly into gaseous state. When vapours of camphor collected then solid camphor is formed, it wont change to any other state. 
In your experiment you have cotton ball plug onto the mouth of the funnel, so vapours don't escape. So these vapours when collected changes directly to solid state.

Regards

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Hi Tanmay, sublimation is the process in which solid gets changed into gas directly without crossing the liquid state.
This happens when temperature increases.
Conversely as temperature decreases then the vapour form would get solidified back. Hence your observation 
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In this activity heat is continuosly supplied and camphor turns into vapour but it turns back to solid form again although the heat is supplied and settle at the sides of walls of the funnel
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