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Final answer:The PO4^1- ion is an oxyanion in chemistry.Explanation:An oxyanion is a negatively charged ion that contains oxygen. Among the ions listed, thePO41-ion is an example of an oxyanion. This ion is called phosphate and it consists of one phosphorus atom bonded to four oxygen atoms. The negative charge is balanced by the presence of one additional electron, denoted by the superscript 1-.Learn more about oxyanions here:brainly.com/question/13692232...