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The category the ion PO43- belong to polyatomic anion. The correct option among all the options that are given in the question is the third option or option "C". It is anion because the charge is negative. I hope that this is the answer that you were looking for and the answer has actually come to your help.

Answer: C.) polyatomic anion

Explanation: Cations are the ions which carry a positive charge and anions are the ions which carry a negative charge. Monoatomic ions are those which consists atoms of similar elements and polyatomic ions are those which consists of atoms of different elements.

For example : \(H^+\) is a monoatomic cation.

\(Br^-\) is an monoatomic anion.

\(NH_4^+\) is a polyatomic cation.

\(PO_4^{3-}\) is a polyatomic anion as it consists of atoms of phosphorous and oxygen and bears a negative charge.

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