The chemical equation shown here is an example of what type of reaction? 2hclo4 (aq) + mg(oh)2 (s), ↔ mg(clo4)2 (aq) + 2h2o (aq)

We are given the balanced equation:2hclo4 (aq) + mg(oh)2 (s)  ↔  mg(clo4)2 (aq) + 2h2o (aq)
First upon seeing the whole equation, I can say that the reaction is a reversible reaction as indicated by the symbol ↔

Second, this reaction is a neutralization reaction, we can see that an acid and a base is reacted to form a salt and water.