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、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
A、SiO<sub>2sub>;Al<sub>2sub>O<sub>3sub>、Fe<sub>2sub>O<sub>3sub> B、Al<sub>2sub>O<sub>3sub>;Fe<sub>2sub>O<sub>3sub>、SiO<sub>2sub> C、Fe<sub>2sub>O<sub>3sub>;SiO<sub>2sub>、Al<sub>2sub>O<sub>3sub>
A、H<sub>2sub>S、 C<sub>2sub>O<sub>4sub>2-、 HCO<sub>3sub>- B、HPO<sub>4sub>2-、 NH<sub>4sub>+、 [Fe(H<sub>2sub>O)<sub>6sub>]3+ C、Na(S)、BF<sub>3sub>、H<sub>2sub>O D、NH<sub>4sub>+、CO<sub>3sub>2-、H<sub>2sub>O
A、Fe<sub>2sub>O<sub>3sub> B、Fe<sub>3sub>O<sub>4sub> C、FeCO<sub>3sub> D、2Fe<sub>2sub>O<sub>3sub>·3H<sub>2sub>O
A、H<sub>2sub>C<sub>2sub>O<sub>4sub>·2H<sub>2sub>O B、Na<sub>2sub>C<sub>2sub>O<sub>4sub> C、As<sub>2sub>O<sub>3sub> D、Fe
A、MnO4-,H<sub>2sub>O<sub>2sub> B、Cl<sub>2sub>,NaOH C、Cr<sub>2sub>O<sub>7sub>2-,Fe3+ D、I-,Fe3+
A、CaO、SiO<sub>2sub>、Al<sub>2sub>O<sub>3sub>、Fe<sub>2sub>O<sub>3sub> B、CaO、SiO<sub>2sub>、Al<sub>2sub>O<sub>3sub>、MgO C、f-CaO、SiO<sub>2sub>、Al<sub>2sub>O<sub>3sub>、Fe<sub>2sub>O<sub>3sub>
A、2H++2e-=H<sub>2sub>↑ B、Fe2++2e-=Fe C、2H<sub>2sub>O+O<sub>2sub>+4e-=4OH- D、Fe3++e-=Fe2+