WAEC - Chemistry (2012 - No. 12)
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
Na3Al(OH)4.
NaAl(OH)4
NaAl(OH)3
Na2Al(OH)3
Explanation
When aluminium is treated with dilute sodium hydroxide it forms a salt called sodium tetrahydroxoaluminate and hydrogen gas.