Which of the following practices helps in preventing chemical reactions during storage?

Labeling containers accurately and storing them compatibly is a crucial practice in preventing chemical reactions during the storage of hazardous materials. When chemicals are properly labeled, it ensures that personnel can quickly identify the contents of each container. This is essential for adhering to safety protocols, as certain chemicals can react violently with others when mixed or stored in proximity.

Additionally, storing chemicals compatibly means placing only those substances that do not react with one another in the same area or container. For example, corrosive acids should not be stored next to bases, and oxidizers should be kept away from flammable materials. This practice significantly reduces the risk of accidental reactions that could lead to fires, explosions, or the release of toxic fumes, thereby enhancing safety in the storage environment.

In contrast, the other options present practices that could dangerously increase the risk of unintended chemical reactions. Storing all chemicals together without regard for their compatibility could lead to catastrophic incidents, while using generic labels obfuscates critical hazard information. Mixing incompatible chemicals to test stability is fundamentally unsafe and poses significant risks without offering informative benefits.