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Some solubility rules for ionic compounds in water are shown for your reference. Insoluble sulfide compounds are generally black in color. Which of the following combinations could yield a black precipitate? Check all hat apply. a) Na2S(aq) + KCl(aq) b) Li2S(aq) + Pb(NO3)2(aq) c) Pb(ClO3)2(aq) + naNO3(aq) d) AgNO3(aq) + KCl(aq) e) K2S(aq) + Sn(NO3)4(aq)