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Rusting of iron is represented by the formula Fe2O3.xH2O. The intermediate species formed during rusting is:

1. Fe2O3
2. Fe(OH)3
3. Fe(OH)2
4. a mixture of Fe2O3 and Fe(OH)3

Correct answer: Fe(OH)3

Solution

During rusting Fe is oxidised to Fe(2+) then Fe(3+), forming Fe(OH)3, which loses water to give the hydrated oxide Fe2O3.xH2O (rust).

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