A、K<sub>2sub>CrO<sub>4sub> B、K<sub>2sub>Cr<sub>2sub>O<sub>7sub> C、NH<sub>4sub>Fe(SO<sub>4sub>)<sub>2sub> D、荧光黄
A、K<sub>2sub>CrO<sub>4sub> B、K<sub>2sub>Cr<sub>2sub>O<sub>7sub> C、NH<sub>4sub>Fe(SO<sub>4sub>)<sub>2sub> D、荧光黄
A、K<sub>2sub>Cr<sub>2sub>O<sub>4sub>溶液 B、K<sub>2sub>CrO<sub>4sub>溶液 C、FeCl<sub>3sub>溶液 D、NH<sub>4sub>SCN溶液
A、应用范围广 B、K<sub>2sub>Cr<sub>2sub>O<sub>7sub>溶液稳定 C、K<sub>2sub>Cr<sub>2sub>O<sub>7sub>无公害 D、K<sub>2sub>Cr<sub>2sub>O<sub>7sub>易于提纯 E、在稀盐酸溶液中,不受Cl-影响
A、K<sub>2sub>CrO<sub>7sub> B、K<sub>2sub>Cr<sub>2sub>O6 C、K<sub>2sub>CrO<sub>4sub> D、K<sub>2sub>Cr<sub>2sub>O<sub>7sub>
A、KMnO<sub>4sub> B、K<sub>2sub>Cr<sub>2sub>O<sub>7sub> C、K<sub>2sub>CrO<sub>4sub> D、KI E、淀粉
A、Na<sub>2sub>S<sub>2sub>O<sub>3sub> B、NaNO<sub>3sub> C、K<sub>2sub>Cr<sub>2sub>O<sub>7sub> D、KMnO<sub>4sub>
A、KMnO<sub>4sub> B、K<sub>2sub>Cr<sub>2sub>O<sub>7sub> C、Na<sub>2sub>S<sub>2sub>O<sub>3sub> D、NH<sub>4sub>SCN