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  • Stuck here, help me understand: Which one of the following species is diamagnetic in nature?

Which one of the following species is diamagnetic in nature?

  • Option 1)

    He{_{2}}^{+}

  • Option 2)

    H_{2}

  • Option 3)

    H{_{2}}^{+}

  • Option 4)

    H{_{2}}^{-}

 

Answers (2)

best_answer

As we learnt

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

 

 He{_{2}}^{+}\rightarrow \sigma \left ( 1s \right )^{2}\sigma ^{\ast }\left ( 1s \right )^{1}one\: unpaired\: electron\:

H{_{2}}\rightarrow \sigma \left ( 1s \right )^{2}\sigma ^{\ast }\left ( 1s \right )^{0}no\: unpaired\: electron\:

H{_{2}}^{+}\rightarrow \sigma \left ( 1s \right )^{1}\sigma ^{\ast }\left ( 1s \right )^{0}one\: unpaired\: electron\:

H{_{2}}^{-}\rightarrow \sigma \left ( 1s \right )^{2}\sigma ^{\ast }\left ( 1s \right )^{1}one\: unpaired\: electron\:

Due to absence of unpaired electrons, H{_{2}} will be diamagnetic


Option 1)

He{_{2}}^{+}

This option is incorrect. 

Option 2)

H_{2}

This option is correct. 

Option 3)

H{_{2}}^{+}

This option is incorrect. 

Option 4)

H{_{2}}^{-}

This option is incorrect. 

Posted by

Aadil

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