Whether something is a chemical weapon depends also on use, not only on content. https://www.opcw.org/our-work/what-chemical-weapon https://www.opcw.org/our-wo

Whether something is a chemical weapon depends also on use, not only on content. https://www.opcw.org/our-work/what-chemical-weapon https://www.opcw.org/our-work/what-chemical-weapon So yes, any of the above chemicals if they were to be used to cause harm via their toxic properties, would be chemical weapons according to OPCW.