\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
\(Al_2O_3+2NaOH\rightarrow2NaAlO_2+H_2O\)
\(4Al+30_2\underrightarrow{t^o}2Al_2O_3\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)
\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
\(Al_2O_3+2NaOH\rightarrow2NaAlO_2+H_2O\)