a)
1)\(Fe_2O_3+3H_2SO_4->Fe_2\left(SO_4\right)_3+3H_2O\)
2) \(Fe_2\left(SO_4\right)_3+3BaCl_2->3BaSO_4\downarrow+2FeCl_3\)
3) \(FeCl_3+3NaOH->Fe\left(OH\right)_3\downarrow+3NaCl\)
4) \(Fe\left(OH\right)_3+3HCl->FeCl_3+3H_2O\)
b)
1) \(2Al+6HCl->2AlCl_3+3H_2\)
2) \(AlCl_3+3NaOH->3NaCl+Al\left(OH\right)_3\downarrow\)
3) \(2Al\left(OH\right)_3\underrightarrow{t^o}Al_2O_3+3H_2O\)
4) \(Al_2O_3+2NaOH->2NaAlO_2+H_2O\)
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