Paramagnetism is exhibited by molecules

  • A

    Not attracted into a magnetic field

  • B

    Containing only paired electrons

  • C

    Carrying a positive charge

  • D

    Containing unpaired electrons

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${{\rm{H}}{{\rm{e}}_2}}$ molecule is not possible.

Although $CN^-$ ion and $N_2$ molecule are isoelectronic, yet $N_2$ molecule is chemically inert because of

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The molecular orbital configuration of a diatomic molecule is

$\sigma \,\,1{s^2}\,\,{\sigma ^*}\,\,1{s^2}\,\sigma \,\,2{s^2}\,{\sigma ^*}\,2{s^2}\,\,\sigma \,2p_x^2\,\left\{ {{}_{\pi \,2p_z^2}^{\pi \,2p_y^2}} \right.$ 

Its bond order is

Assertion : $B_2$ molecule is diamagnetic.
Reason : The highest occupied molecular orbital is of $\sigma $ type.

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Which of the following has the minimum bond length ?

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