2 Al0 + 2 NaOHI + 6 H2IO 2 Na[AlIII(OHI)4] + 3 H20

This is a complexation reaction: Na[Al(OH)4] is the formed complex.

This is an oxidation-reduction (redox) reaction:

6 HI + 6 e- 6 H0 (reduction)

2 Al0 - 6 e- 2 AlIII (oxidation)

Change the oxidation states