What type of reaction is 2 Al2O3(s) → 4 Al(s) + 3 O2(g)

Decomposition or cracking

Explanation:

 Given reaction:

           2Al₂SO₃  →  4Al  + 3O₂

This reaction is a decomposition or cracking reaction.

In such a reaction, two or more products are formed from a single reactant; e.g;

             A  →  B + C

The breakdown of  a compound into component individual elements or other compounds falls into this type of reaction.

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