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Which option contains an example of a polyatomic ion?(1 point)

Responses

O2
O 2

MgCl
MgCl

KNO3
KNO 3

CaCl2
CaCl 2

1 answer

The option that contains an example of a polyatomic ion is:

KNO3

In this case, KNO3 contains the nitrate ion (NO3^-), which is a polyatomic ion. The other options either represent diatomic or simple ionic compounds, not polyatomic ions.