The following expressions pertain to the precipitation or dissolving of metal sulfides. Use information about the qualitative cation analysis scheme to predict whether a reaction proceeds to a significant extent in the forward direction and what the products are in each case.

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(a) Cu²+ (aq) + H₂S (satd aq) (b) Mg2+ (aq) + H₂S (satd aq) (c) PbS(s) + HC1 (0.3 M) (d) ZnS (s) + HNO3(aq) 0.3 M HCI