Answer: The given statement is false.
Explanation:
Precipitation reaction is defined as the chemical reaction in which two aqueous solution upon mixing together results in the formation of an insoluble solid.
For example, [tex]NaCl(aq) + AgNO_{3} \rightarrow NaNO_{3}(aq) + AgCl(s)[/tex]
Here AgCl is present in solid state so, it is the precipitate.
But it is not necessarily true that two aqueous solutions will always result in the formation of a precipitate.
For example, [tex]NaCl(aq) + KNO_{3}(aq) \rightarrow KCl(aq) + NaNO_{3}(aq)[/tex]
Hence, we can conclude that the statement precipitation reactions always occur when two aqueous solutions are mixed, is false.