Final answer:
In the given chemical equation, PbCl2 is denoted as (s), which means it is a solid. It precipitates from the reaction, making it the precipitate in this precipitation reaction. The option (A) is correct.
Step-by-step explanation:
In the chemical equation 2AlCl3(aq) + 3Pb(NO3)2 (aq) → 3PbCl2(s) + 2Al(NO3)3(aq), the state of PbCl2 is indicated as (s), which stands for solid.
This denotes that PbCl2 precipitates out of the solution in this chemical reaction. Reactions that produce a solid as a product are commonly known as precipitation reactions, where the solid formed is referred to as the precipitate. In this case, PbCl2 is the precipitate formed when solutions of AlCl3 and Pb(NO3)2 are mixed. Therefore, option (A) is correct.