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The correct purpose of placards and labels on a storage container is to give a general idea of the hazards inside that container. These visual indicators are essential for ensuring safety during the handling and transportation of hazardous materials. They communicate critical information at a glance, allowing emergency responders and handlers to quickly assess the potential dangers associated with the contents.

Placards typically include standardized symbols and color codes, which represent specific categories of hazards, such as flammability, chemical reactivity, toxicity, and environmental hazards. By offering a general overview of these risks, placards and labels facilitate informed decision-making and help to prevent accidents during the transportation and storage of hazardous substances.

While specific information about the chemical, classification as explosive or nonexplosive, and appropriate neutralizing measures are also important, the primary role of placards and labels is to effectively communicate the overall hazards to ensure safety. They are not intended to provide exhaustive details but rather serve as a first line of defense in hazard recognition.