Question

Identify the polyatomic ions among the following:

• A. $N{H}^{4+}$
• B. $A{l}^{3+}$
• C. $O^{2-}$
• D. Hydroxide ion

Answer 1

Answer: (A), (D)

The correct options are
A $N{H}^{4+}$
D Hydroxide ion

An ion is an atom with a positive or a negative charge. A polyatomic ion is the one which has more than one atom within the ionic group. The formula of hydroxide ion is $O{H}^{-}$. O and H make it polyatomic. Similarly, $N{H}^{4+}$ is also a polyatomic ion.