Now that we know the oxidation numbers for the metals Zn, Fe, and Cd we can predict how they will react with Hydrogen Sulfide (H2S). Give it a shot...React ZnCl2, FeCl3, and CdCl2 with H2S.
Hint 1: What is the oxidation number of H?
Hint 2: What is the oxidation number of S?
Your final Hint: The charge needs to be balanced.
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