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it's Oxyanion
An oxyanion is in the form of AxOy, where A is a chemical or polyatomic ion, and O is an oxygen.
Any acid that contains hydrogen and an oxyanion is referred to as an oxyacid.
* An oxyanion is a polyatomic ion that contains oxygen
No. An oxyanion is a polyatomic negative ion that contains oxygen. Ammonium is a cation (positive ion) and does not contain oxygen.
Chlorate ion