Which of the following contains the sulfate ion?

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Multiple Choice

Which of the following contains the sulfate ion?

Explanation:
The sulfate ion is SO4^2−, a polyatomic anion. A salt that contains sulfate will include this SO4^2− unit in its formula. Copper sulfate, written as CuSO4, contains Cu^2+ paired with SO4^2−, so it includes the sulfate ion. The other compounds represent different ions: Fe2O3 is iron(III) oxide (oxide ions), PbS is lead sulfide (sulfide ion), and KNO3 is potassium nitrate (nitrate ion). Therefore, the one that contains the sulfate ion is copper sulfate.

The sulfate ion is SO4^2−, a polyatomic anion. A salt that contains sulfate will include this SO4^2− unit in its formula. Copper sulfate, written as CuSO4, contains Cu^2+ paired with SO4^2−, so it includes the sulfate ion. The other compounds represent different ions: Fe2O3 is iron(III) oxide (oxide ions), PbS is lead sulfide (sulfide ion), and KNO3 is potassium nitrate (nitrate ion). Therefore, the one that contains the sulfate ion is copper sulfate.

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