Which of the following are polyatomic ions?

{N H_{4}}^{+}

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{S O_{4}}^{2 -}

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{M n O_{4}}^{-}

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C l^{-}

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Solution

The correct option is C ${M n O_{4}}^{-}$
Polyatomic ions are those ions which contain atoms of more than one element.
$\begin{matrix} Ions & Constituent Atoms {N H_{4}}^{+} & 1 N, 4 H {S O_{4}}^{2 -} & 1 S, 4 O {M n O_{4}}^{-} & 1 Mn, 4 O C l^{-} & 1 Cl \end{matrix}$ Hence, from the given options, the polyatomic ions are:
${N H_{4}}^{+}$ , ${SO}_{4}_{4}^{2 -}$ , ${M n O_{4}}^{+}$

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