The composition of rust is

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Fe2O3. xH2O

Fe2O3 . 2H2O

Fe2O3.6H2O

Fe2O3

answer is A.

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Detailed Solution

Rusting of Iron involves.Fe+2 oxidises in air to form Fe+3 which finally forms Fe2O3.XH2O, which is reddish brown in colour.

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