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The balanced chemical equation when rust occurs is given as.

  1. 2Fe(s) + 2H2O(l) + O2(g) 2Fe2+(aq) + 4OH-(aq)
  2. Fe2+(aq) + 2OH-(aq) Fe(OH)2(s)
  3. Fe(OH)2(s) =O2=> Fe(OH)3(s)
  4. Fe(OH)3(s) =dehydrates=> Fe2O3.nH2O(s) or rust
The chemical formula for rust is Fe2O3.nH2O.The overall chemical equation for the formation of rust isIron + water + oxygen rust
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