The reaction where aluminum oxide reacts with water to form aluminum hydroxide is a hydration or combination reaction, where water is added to a compound and elements retain their oxidation states.
The chemical reaction 1 Al₂O₃ + 3 H₂O → 2 Al(OH)₃ represents a hydration reaction or a combination reaction. In this type of reaction, aluminum oxide reacts with water to form aluminum hydroxide.
These reactions involve adding water to a compound or combining substances to form a single product, which in this case is Al(OH)₃.
No redox process occurs here since the oxidation states of the elements do not change; aluminum remains in the +3 oxidation state and oxygen in the -2 state. Such reactions are typically part of inorganic chemistry and material sciences discussions.