Since direct solution keys for this specific 1993 edition are rare on mainstream GDZ websites, you can use these alternatives to verify your work:
Understanding the difference between observation (direct registration of events) and experimentation. Since direct solution keys for this specific 1993
If you are struggling with a specific task from the manual, ensure you understand these core formulas and definitions often tested in Sofronov’s tasks: is the valence of the metal. Since direct solution keys for this specific 1993