The answer "formation of a precipitate" it is correct.
Explanation:
In a double-displacement two reactants will exchange atoms or group of atoms between themselves to form the products. Generally we can write the reaction as following:
AB + CD → AC + BD
Of course to drive the chemical reaction to the right, one of the products have to be a precipitate.
As example we have the chemical reaction of sodium chloride (NaCl) with silver nitrate (AgNO₃):
NaCl (aq) + AgNO₃ (aq) → NaNO₃ (aq) + AgCl (s)
where:
(aq) - aqueous
(s) - solid
Learn more about:
types of chemical reactions
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