| 选项 | M | N | P | Q |
| A | NH3·H2O | Ba(OH)2 | 铜 | KSCN |
| B | Na | BaCl2 | FeO | KSCN |
| C | NaOH | Ba(NO3)2 | 锌粉 | KSCN |
| D | Na2O2 | MgCl2 | Fe | KSCN |
