Which of the following is a polyatomic ion?

Question

Quizplus · Accepted Answer

A polyatomic ion is a charged particle which consists of two or more atoms covalently bonded or of a metal complex that acts as a single unit. The correct answer is D) $ \text{SO}_4^{2-} $, which is sulfate, a well-known polyatomic ion consisting of one sulfur atom covalently bonded to four oxygen atoms and carrying a -2 charge. Choices A, B, and C do not represent polyatomic ions; A is a molecule (hydrogen cyanide), and B and C are incorrectly formatted and do not correspond to recognized polyatomic ions.

Which of the Following Is a Polyatomic Ion