Chemistry Regents Practice Test

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Study for the Chemistry Regents Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Master the curriculum and get ready to excel in your exam!

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Which polyatomic ion is known to have a charge of 3?

Nitrate ion
Sulfate ion
Phosphate ion
Carbonate ion

The correct answer is: Phosphate ion

The phosphate ion is characterized by having a charge of -3. This ion consists of one phosphorus atom bonded to four oxygen atoms, with the overall structure carrying a cumulative negative charge. This negative charge is due to the presence of the three additional electrons that come from the extra bonds formed in the structure. In contrast, other ions listed do not have a charge of -3. For example, the nitrate ion carries a -1 charge, the sulfate ion has a charge of -2, and the carbonate ion also has a charge of -2. Understanding the charges of these polyatomic ions is crucial for predicting how they will react chemically and form compounds with different elements. Thus, the charge of -3 associated with the phosphate ion is a distinctive feature that sets it apart from the others.