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Question

Identify the polyatomic ions from the following.


A

NH4+

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B

Al3+

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C

O2

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D

Hydroxide ion

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Solution

The correct options are
A

NH4+


D

Hydroxide ion


An ion is an atom with positive or negative charge over it. A polyatomic ion is the one which has more than one atom within the ionic group. The formula of hydroxide ion is OH. O and H make it polyatomic. Similarly, NH4+ is also a polyatomic ion.
Note: Don't get confused between the charge on the ion and the atomicity. Here Al3+ and O2 have +3 and -2 charges respectively, but each one is a single atom.


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