Multiple choice

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.

The concentration of S2–, at which FeS begins to precipitate from the mixture having 0.1 M Fe2+ is

  1. 1.0 $\times$ 10–17 M
  2. 1.0 $\times$ 10–18 M
  3. 10 $\times$ 10–19 M
  4. 1.0 $\times$ 10–29 M
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