Question

what is the type of reaction between aluminium oxide and hydrochloric acid? e.g displacement

Answer 1

\[Al _{2}O _{3}+6HCl \rightarrow 2AlCl _{3}+3H _{2}O\]
This is a double displacement reaction.
This is when the anions and cations of two different molecules switch places, forming two entirely different compounds.
The general form of a double displacement is
\[AB+CD \rightarrow AD+CB\]