If the magnetic moment of a dioxygen species is $1.73 \;B.M$, it may be

  • [JEE MAIN 2020]
  • A

    $\mathrm{O}_{2}^{-}$ or $\mathrm{O}_{2}^{+}$

  • B

    $\mathrm{O}_{2}$ or $\mathrm{O}_{2}^{+}$

  • C

    $\mathrm{O}_{2}$ or $\mathrm{O}_{2}^{-}$

  • D

    $\mathrm{O}_{2}, \mathrm{O}_{2}^{-}$ or $\mathrm{O}_{2}^{+}$

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Identify a molecule which does not exist.

  • [NEET 2020]

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Number of paramagnetic oxides among the following given oxides is ..... .

$\mathrm{Li}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{Na}_{2} \mathrm{O}_{2}, \mathrm{KO}_{2}, \mathrm{MgO}$ and $\mathrm{K}_{2} \mathrm{O}$

  • [JEE MAIN 2021]

Which one of the following is paramagnetic