Answer
$Fe^{2+}(aq) + S^{2−}(aq) → FeS(s)$
Work Step by Step
We know:
$(NH_{2})_{2}S(aq) + FeCl_{2}(aq) → FeS(s) + 2 NH_{4}Cl(aq)$
Thus, the net ionic equation is:
$Fe^{2+}(aq) + S^{2−}(aq) → FeS(s)$
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