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Which of the following is not a polyatomic ion? A) NO3-

B) CaCO3
C) C2H3O2-
D) C6H5COO-

User Cldwalker
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2 Answers

5 votes

CaCO3 is your answer!

User Datcn
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6 votes
CaCO₃ is a compound in and of itself thus it is not a polyatomic ion.
User Ryan Drost
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