The total number of species from the following in which one unpaired electron is present, is $\mathrm{N}_2, \mathrm{O}_2, \mathrm{C}_2^{-}, \mathrm{O}_2^{-}, \mathrm{O}_2^{2-}, \mathrm{H}_2^{+}, \mathrm{CN}^{-}, \mathrm{He}_2^{+}$
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Solution
One unpaired $\mathrm{e}^{-}$is present in $\mathrm{C}_2^{-} ; \mathrm{O}_2^{-} ; \mathrm{H}_2^{+} ; \mathrm{He}_2^{+}$
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