CO, + H2O –H^2 CO^3 The reaction is which type of chemical reaction?

Combination or synthesis reaction

Explanation:

The reaction is a combination or synthesis reaction.

Let us write the reaction equation:

         CO + H₂O →  H₂CO₃

A combination or synthesis reaction is one in which a single product forms from two or more reactants. The formation of a compounds from the union of their constituent elements falls into this category of reaction.