Directions: The solubility products of FeS, ZnS, CuS and HgS are 1.0 ^_$\times$ 4.5 ^_$\times$ 10^–24, 4.0 ^_$\times$ 10^–38 and 3.0 ^_$\times$ 10^–53 respectively.

H₂S is passed through an aqueous solution containing all the four metal ions. The metal ion that precipitates first is

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