Al -> Al2O3 (Aluminum reacts with oxygen to form aluminum oxide)Al2O3 + 6HNO3 -> 2Al(NO3)3 + 3H2O (Aluminum oxide reacts with nitric acid to form aluminum nitrate and water)Al(NO3)3 + 3NaOH -> Al(OH)3 + 3NaNO3 (Aluminum nitrate reacts with sodium hydroxide to form aluminum hydroxide and sodium nitrate)Al(OH)3 + 6KOH -> K3[Al(OH)6] + 3H2O (Aluminum hydroxide reacts with potassium hydroxide to form potassium hexahydroxoaluminate and water)
The correct sequence of reactions is as follows:
Al -> Al2O3 (Aluminum reacts with oxygen to form aluminum oxide)Al2O3 + 6HNO3 -> 2Al(NO3)3 + 3H2O (Aluminum oxide reacts with nitric acid to form aluminum nitrate and water)Al(NO3)3 + 3NaOH -> Al(OH)3 + 3NaNO3 (Aluminum nitrate reacts with sodium hydroxide to form aluminum hydroxide and sodium nitrate)Al(OH)3 + 6KOH -> K3[Al(OH)6] + 3H2O (Aluminum hydroxide reacts with potassium hydroxide to form potassium hexahydroxoaluminate and water)