The total number of species from the following in which one unpaired electron is present,is . . . . . . $N_2, O_2, C_2^{-}, O_2^{-}, O_2^{2-}, H_2^{+}, CN^{-}, He_2^{+}$

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $8$

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