Which of the following is NOT a recommended storage practice for laboratory chemicals?

Among the listed choices, keeping chemicals routinely stored on bench tops is not a recommended storage practice for laboratory chemicals. Storing chemicals on bench tops can lead to several safety hazards, including contamination, spills, and accidental exposure. Proper laboratory safety protocols advise that chemicals should be stored in designated cabinets or areas that are appropriate for their specific types (e.g., flammable, corrosive, or reactive substances) to minimize risks.

In contrast, the other practices mentioned are essential for maintaining a safe laboratory environment. Storing chemicals in appropriate cabinets helps to segregate and protect them based on their properties. Clearly labeling all chemicals facilitates easy identification and reduces the risk of mishandling or accidents. Moreover, ensuring that flammable materials are stored away from heat sources is crucial for preventing fires and explosions in the laboratory. These practices collectively contribute to a safer working environment in scientific settings.