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Which of the following is a polyatomic ion?

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Which of the following is a polyatomic ion?
A. Oxide ion
B. Peroxide ion
C. Superoxide ion
D. Both(1) and (2)
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Correct Answer - D
Peoxide in `(O_(2)^(2-))` and superoxide ion `(O_(2)^(2-))` contain more than one atom.
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