Step-by-step explanation:
MnCl2 and Na2S are mixed
Solubility:
Some reactions yield an insoluble ionic product which we call the precipitate. Such reactions are called precipitation reactions. The easiest way to determine whether a reaction will form a precipitate is through the solubility rules. These rules predict which cations or anions form insoluble salts with anion or cations.
According to this mixture:
MnCl2 (aq) + Na2S (aq) =>2 NaCl (aq) + MnS (s) (completed and balanced)
MnS (s) will precipitate
Answer: a precipitation reaction occurs