Answer is: the type of reaction is
double displacement reaction.
For example, chemical reaction:
Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq).
aq(aqueous) means dissolved in water.
s(solid) means that salt (in this reaction PbI₂) not dissolved in water and
form a yellow precipitate.Cations (Pb²⁺ and K⁺) and anions (NO₃⁻ and I⁻) of the two reactants switch places and form two new compounds.
Double displacement reactions (more reactive metals displace metals with lower reactivity).