Question Detail
Question
Which of the following is an example of a compound that contains a polyatomic ion?
Correct Answer
Option C is the correct answer.
Detailed Explanation
CaCO3 (calcium carbonate) contains the polyatomic ion CO32- (carbonate). NaCl, MgO, and FeS are ionic compounds composed of monatomic ions only.
Hint
Look for a chemical formula that contains a group of atoms within it, such as CO3, SO4, or NO3.