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The Brainliest Answer!
2014-06-01T11:21:52+05:30
Camphor is a solid which diffuses in air. 

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2014-06-01T11:27:45+05:30
If metallic gold and metallic lead are placed in intimate contact , over a period of time , molecules of lead will diffuse into gold and vice versa . 
                                    
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