Which of the following polyatomic ions has a 3- ionic charge: hydrogen carbonate, hydroxide, sulfate, nitrate, or phosphate?
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Answer: Phosphate ion has 3- ionic charge among all the given polyatomic ions.
Explanation:
Phosphate is a polyatomic ion that consists of a central phosphorus atom surrounded by 4 oxygen atoms and is represented as PO4 3-.
It is a strong base that hydrolyzes in water to give rise to a basic solution. Since phosphorus is in the highest oxidation state in phosphate ion, it is not a reducing agent, instead, it is a weak oxidizing agent.
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