Can you write a chemical reaction to show the rusting of iron

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Solution

When iron is exposed to water or air over a period of time, the iron reacts with oxygen in the presence of moisture to form a reddish-brown chemical compound, iron oxide. This is referred to as rust. So chemically, rust is hydrated iron(III) oxide or Fe₂O₃.nH₂O. The chemical equation for the same is given by:

4Fe(OH)₂ + O₂ + xH₂O → 2Fe2O₃.(x+4)H₂O

Iron reacts very readily with oxygen. This is one of the reasons as to why it is rare to find pure iron in nature.

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If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(a) Do you think rust is different from iron?

(b) Can you change rust back into iron by some simple method?

(c) Do you think the formation of rust on iron is a chemical change?

(d) Give two other examples of a similar type of change.

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