A、减小α<sub>isub> B、增大α<sub>isub> C、减小α<sub>osub> D、增大α<sub>osub>
A、[Cr(NH<sub>3sub>)<sub>4sub>(H<sub>2sub>O)<sub>2sub>]Cl<sub>3sub> B、[Cr(NH<sub>3sub>)<sub>4sub>(H<sub>2sub>O)<sub>2sub>Cl]Cl<sub>2sub> C、[Cr(NH<sub>3sub>)<sub>4sub>(H<sub>2sub>O)CL]Cl<sub>2sub>·H<sub>2sub>O D、[Cr(NH<sub>3sub>)<sub>4sub>Cl<sub>2sub>]Cl·2H<sub>2sub>O
A、KMnO<sub>4sub>法测定H<sub>2sub>O<sub>2sub> B、溴酸盐法测定苯酚 C、间接碘量法测定Cu2+ D、用已知准确浓度的Na<sub>2sub>S<sub>2sub>O<sub>3sub>溶液标定I<sub>2sub>
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、Na<sub>2sub>O B、Na<sub>2sub>O与Na<sub>2sub>O<sub>2sub> C、Na<sub>2sub>O<sub>2sub> D、Na<sub>2sub>O与NaO<sub>2sub>
A、B=0,因为B<sub>1sub>=B<sub>2sub>=B<sub>3sub>=0 B、B=0,因为B<sub>1sub>+B<sub>2sub>=0,B<sub>3sub>=0 C、B不等于0,因为虽然B<sub>1sub>=B<sub>3sub>=0,但B<sub>2sub>不等于0 D、B不等于0,因为虽然B<sub>1sub>=B<sub>2sub>=0,但B<sub>3sub>不等于0
A、CH<sub>4sub>+2O<sub>2sub>=2H<sub>2sub>O+CO<sub>2sub> B、2CH<sub>4sub>+3O<sub>2sub>=4H<sub>2sub>O+2CO C、CH<sub>4sub>+O<sub>2sub>=H<sub>2sub>O+CO<sub>2sub> D、CH<sub>4sub>+O<sub>2sub>=H<sub>2sub>O+CO
A、试计算0.4903克纯固体K<sub>2sub>Cr<sub>2sub>O<sub>7sub>的单元的物质的量(已知MK<sub>2sub>Cr<sub>2sub>O<sub>7sub>=294.20g/mol)。
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>