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Question

Which of the following are polyatomic ions?

A
Ammonium
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B
Hydride
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C
Oxide
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D
Hydroxide
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Solution

The correct options are
A Ammonium
D Hydroxide
A monoatomic ion is an ion consisting exactly one atom. While a polyatomic ion is an ion consisting more than one atom.
IonFormulaNo. of Atoms AmmoniumNH+41 N, 4HHydride H1 HOxideO22 OHydroxideOH1 H, 1 O
Thus, OH and NH+4 are polyatomic ions and O2 and H are monoatomic ions.

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