What is rusting ? How does (i) the presence of impurities in the metal (ii) presence of electrolyte in water affect rusting ?

What is rusting ? How does (i) the presence of impurities in the metal

1.	What is rusting ? How does (i) the presence of impurities in the metal (ii) presence of electrolyte in water affect rusting ?
Answer» Solution :Rusting. When IRON is EXPOSED to atmospheric conditions, it reacts with AIR or water in the environment to from undesirable red BROWN coating. This process is called rusting. `underset("Iron")(4Fe)+underset("Oxygen")(3O_(2))tounderset("Ferric oxide")(2Fe_(2)O_(3))` `underset("Ferric oxide")(2Fe_(2)O_(3))+underset("(Moisture)")(xH_(2)O)tounderset("(Hydrated iron (III) oxide)")underset("Rust")(Fe_(2)O_(3)*xH_(2)O)` (i) The presence of impurities in the metal speed up the rusting process. Therefore, pure iron does not rust. (II) The presence of electrolytes in water also speeds up the process of rusting. Therefore, rusting of iron in water (containing sodium chloride) occur quicker than in distilled water.