\(1.Al+4HNO_3\rightarrow Al\left(NO_3\right)_3+NO\uparrow+2H_2O\)
\(2.4Al\left(NO_3\right)_3\underrightarrow{t^0}2Al_2O_3+12NO\uparrow+3O_2\)
\(3.2Al_2O_3\underrightarrow{đpnc}4Al+3O_2\)
\(4.2Al+Ba\left(OH\right)_2+2H_2O\rightarrow Ba\left(AlO_2\right)_2+3H_2\)