Al2O3+6HCl----->AlCl3+3H2O

what type of reaction is this?
-combination
-decompisition
-or double displacement reaction

It is a double displacement reaction, but specifically, an acid -metal oxide reaction of the form

MO+HA>>salt+ Water

To determine the type of reaction, we need to understand the different types of reactions and their characteristics.

In this chemical equation: Al2O3 + 6HCl → AlCl3 + 3H2O

Al2O3 represents aluminum oxide, and HCl represents hydrochloric acid.

Now let's go through the options:

1. Combination reaction: A combination reaction occurs when two or more reactants combine to form a single product. This reaction typically follows the format: A + B → AB. However, in the given equation, we see two reactants (Al2O3 and HCl) combining to produce two products (AlCl3 and H2O). So, this is not a combination reaction.

2. Decomposition reaction: A decomposition reaction involves the breakdown of a compound into its elemental components or simpler compounds. This reaction typically follows the format: AB → A + B. In the given equation, Al2O3 breaks down into AlCl3 and H2O. Therefore, this is not a decomposition reaction.

3. Double displacement reaction: A double displacement reaction (also known as a metathesis reaction) occurs when the positive and negative ions of two compounds exchange places. It can be represented by the following format: AB + CD → AD + CB. In the given equation, Al2O3 reacts with HCl to form AlCl3 and H2O, where aluminum chloride (AlCl3) and water (H2O) are new products. Therefore, this is a double displacement reaction.

Hence, the correct answer is:

- Double displacement reaction