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Rust is Fe2O3 ....it can not be removed by

1.HCl

2.H2So4

3.Edta.....

but can remove by Oxalic Acid H2C2O4

Fe2O3(s) + 6 H2C2O4(aq) → 2 Fe(C2O4)3 3−(aq) + 3 H2O(l) + 6 H+(aq)

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