Give some examples for corroded and non corroded metals and give the reasons for non corrosion of metals.

Explanation

Examples to corroded metals : 1) Iron `" "` 2) Copper`" "` 3) Silver
Reactions : `4Fe+3O_(2) rarr 2Fe_(2)O_(3)`
`2Cu+O_(2) rarr 2CuO`
`4Ag + 2H_(2)S+O_(2) rarr 2A_(2)S+2H_(2)O`
Exmples to non corroded metals :
1) Gold 2) Platinum 3) Brass 4) Bronze 5) Steel
Reason :
1) Goldand platinum metals are non react with oxygen and have resistance to corrosion.
2) Brass, bronze and steel are alloys. So they have a quality of resistance to corrosion.