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IMAT Chemistry Practice Exam
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Which of the following is the phosphate ion?
Sulfate
Phosphate
Carbonate
Nitrate
Reveal Answer
Correct Answer:
Phosphate
Explanation:
Recognize common oxyanions by their central atom and formula. The phosphate ion is the one with phosphorus surrounded by four oxygens, giving the formula PO4^3- and an overall -3 charge. This combination—phosphorus + four oxygens with a -3 charge—distinguishes it from the others: sulfate has sulfur with four oxygens and a -2 charge (SO4^2-), carbonate has carbon with three oxygens (CO3^2-), and nitrate has nitrogen with three oxygens and a -1 charge (NO3^-). So PO4^3- is the phosphate ion.
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