Question

ᴇxᴘʟᴀɪɴ ᴡʜʏ sᴜʀғᴀᴄᴇ ᴏғ sᴏᴍᴇ ᴍᴇᴛᴀʟs ᴀᴄϙᴜɪʀᴇ ᴀ ᴅᴜʟʟ ᴀᴘᴘᴇᴀʀᴀɴᴄᴇ ᴡʜᴇɴ ᴇxᴘᴏsᴇᴅ ᴛᴏ ᴀɪʀ ғᴏʀ ᴀ ʟᴏɴɢ ᴛɪᴍᴇ..​

Answer 1

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✨Surface of some metals acquires a dull appearance because they react with air or water in the environment to form undesirable compounds (such as Oxides) . This process is called Corrosion.

✨For example:- silver tarnishes, copper Develops green coating, iron loses its lustre. The Corrosion of iron is called Rusting. The chemical formula of Rust is Fe2O3.xH2O.

Answer 2

Hey mate,.

It's because of corrosion.

For example:-

Iron get rust.where it's gets oxide with air and becomes faded.

Hope it will help you

✌️sai