The formula for rust is:

(A) FeO

(B) Fe2O3

(C) Fe3O4

(D) Fe2O3 xH2O

Answer Posted / joshua tamm

the answer is all of them

its to do with oxidation states, of fe2+ and fe3+
and as for the last one, that is another way of saying the
rust is hydrated (i.e water is traped in the bonds of the
rust)

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