Final answer:
Pictograms must be placed on the labels of hazardous chemical containers or directly on the container. They provide essential safety information and are required by global hazard communication standards. Safety data sheets provide detailed information on handling and disposal but do not have pictograms directly on them.
Step-by-step explanation:
Pictograms are required to be placed on hazardous chemicals to provide important safety information. These pictograms are a key feature in globally harmonized systems (GHS) for hazard communication. When it comes to where pictograms must be placed, the correct options would be:
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Pictograms are not typically placed on safety data sheets directly, but the data sheets will provide information about which pictograms are associated with the chemical. Packaging for transportation may also have these pictograms if the product is hazardous. The hazard diamond or fire diamond is an example of a pictogram that provides brief but vital information about the dangers of a chemical.
In a laboratory setting or when working with substances that could pose a risk, always refer to the safety data sheets for full information on handling, potential risks, and disposal. Remember to consult these resources before working with new chemicals and to follow proper protocols for disposal, which should not include simply pouring chemicals down the sink.