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Q.

The composition of rust is

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a

Fe2O3 . xH2O

b

Fe2O3 . 2H2O

c

 Fe2O3 . 6H2O

d

 Fe2O3

answer is A.

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Detailed Solution

Rust is nothing but a mixture of oxides of iron which are formed on the surface of the iron.
It is a result of a redox reaction between atmospheric oxygen and Iron in the presence of water/moisture.

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The composition of rust is