A、A.2FeCl3+S2-=2FeCl2+S↓+2Cl- B、B.2Fe3++S2-=2Fe2++S↓ C、C.2Fe3++H2S=Fe2++S↓+2H+ D、D.2Fe3++H2S=2Fe2++S↓+2H+
A、A.2FeCl3+S2-=2FeCl2+S↓+2Cl- B、B.2Fe3++S2-=2Fe2++S↓ C、C.2Fe3++H2S=Fe2++S↓+2H+ D、D.2Fe3++H2S=2Fe2++S↓+2H+
A、2Fe+6HCl==2FeCl<sub>3sub>+3H<sub>2sub>↑ B、Fe<sub>2sub>O<sub>3sub>+HCl==FeCl<sub>2sub>+H<sub>2sub>O C、Cu+2HCl==CuCl<sub>2sub>+H<sub>2sub>↑ D、Cu(OH)<sub>2sub>+2HCl==CuCl<sub>2sub>+ 2H<sub>2sub>O
A、Fe<sub>2sub>O<sub>3sub>+3H<sub>2sub>SO<sub>4sub>==Fe<sub>2sub>(SO<sub>4sub>)<sub>3sub>+3H<sub>2sub>O B、Cu(OH)<sub>2sub>+2HCl==CuCl<sub>2sub>+2H<sub>2sub>O C、CaCO<sub>3sub>+2HCl==CaCl<sub>2sub>+H<sub>2sub>O+CO<sub>2sub>↑ D、BaCl<sub>2sub>+H<sub>2sub>SO<sub>4sub>==BaSO<sub>4sub>↓+2HCl