ᴇxᴘʟᴀɪɴ ᴡʜʏ sᴜʀғᴀᴄᴇ ᴏғ sᴏᴍᴇ ᴍᴇᴛᴀʟs ᴀᴄϙᴜɪʀᴇ ᴀ ᴅᴜʟʟ ᴀᴘᴘᴇᴀʀᴀɴᴄᴇ ᴡʜᴇɴ ᴇxᴘᴏsᴇᴅ ᴛᴏ ᴀɪʀ ғᴏʀ ᴀ ʟᴏɴɢ ᴛɪᴍᴇ..
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Answered by
1
Those metals whose surface acquire a dull appearance are Copper....
It happens because being reactive it reacts with substances present in the atmosphere and forms an outer layer above the surface.
Answered by
2
Hey mate,.
It's because of the process - corrosion.
Where the surface area of an object gets faded when it gets oxide with atmospheric air.
Hope it will help you
✌️sai
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