Zn + 2 NaOH + 2 H2O → Na2[Zn(OH)4] + 2 H
This is a complexation reaction: Na2[Zn(OH)4] is the formed complex.
This is an oxidation-reduction (redox) reaction:
Zn0 - 2 e- → ZnII (oxidation)
2 HI + 2 e- → 2 H0 (reduction)
Warning: Unknown compound 'H'