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  2. The pairs of species of oxygen and their magnetic behaviour are noted below. Whichof the follow ing presents the correct description?
# Engineering

The pairs of species of oxygen and their magnetic behaviour are noted below. Whichof the follow ing presents the correct description?

Answers (1)
A Ankit Dutt

As we learnt in

Magnetic behaviour of molecule -

If  all the molecular orbitals in a molecule are doubly occupied, the substance is diamagnetic

- wherein

However if one or more molecular orbital are singly occupied it is paramagnetic e.g. O2

Electronic configuration of O_{2} molecule 

\sigma_{2s}^{2}\;\sigma_{2s}^{*2} \; \sigma_{2p}^{2}\; \pi_{2px}^{2}\; \pi_{2py}^{2}\; \pi_{2px}^{*1}\; \pi_{2py}^{*1}

Since there are 2 unpaired electrons in 2p_x & 2p_y degenerate orbitals, so, O_{2} is paramagnetic.

Similarly, for O_{2}^{*} molecule, we have 

\sigma_{2s}^{2}\;\sigma_{2s}^{*} \; \sigma_{2p}^{2}\; \pi_{2p}^{2}\; \pi_{2py}^{2}\; \pi_{2px}^{*1}

Since, there is 1 unpaired electron in 2p_x orbital, 

\therefore O_{2}^{+} is paramagnetic.


Option 1)

O^{-}_{2}, O_{2}^{2-}      - Both diamagnetic

This option is incorrect.

Option 2)

O^{+}, O_{2}^{2-}      -  Both paramagnetic

This option is incorrect.

Option 3)

O_{2}^{+}, O_{2}     - Both paramagnetic

This option is correct.

Option 4)

O, O_{2}^{2-} -  Both paramagnetic

This option is incorrect.

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