Q.

The chemical formula of rust is:

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a

FeO

b

Fe2O3.xH2O

c

FeO.xH2O

d

Fe3O4

answer is D.

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Detailed Solution

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Rust is hydrated ferric oxide and its chemical formula is Fe2O3.xH2O . The generic name of a very common compound iron oxide is rust. Iron oxide, the Fe2O3  is abundant because iron is so easily mixed with oxygen so readily, in fact, that pure iron is rarely present in nature. So, rusted iron is always present in  Fe2O3.xH2O form.

The chemical equation for the formation of rust is given as:

4Fe+3O2+xH2O2Fe2O3.xH2O

Hence, we can say that the chemical formula of rust is Fe2O3.xH2O.

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