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In which of the following octahedral complexes of Co (At. no. 27), will be magnitude of \Delta _{oct} be the highest?

  • Option 1)

    \left [ Co(NH_3)_6 \right ]^{3+}

  • Option 2)

    \left [ Co(CN)_6 \right ]^{3-}

  • Option 3)

    \left [ Co(C_2O_4)_3 \right ]^{3-}

  • Option 4)

    \left [ Co(H_2O)_6 \right ]^{3+}

 

Answers (1)

best_answer

As we learned

 

Strong Field Ligand -

These are the ligands which pair the electron in inner d-orbital and makes required d-orbitals empty/available. 

- wherein

For example: CO, CN etc

 

 

\left [ Co\left ( CN \right )_{6} \right ]^{3-}\Rightarrow

CN- is a strong field and makes low spin complex with Co3+ d6 electrons in t2g orbital.

So,

CFSE=6\times (-0.4)=-2.4\bigtriangleup .

For this reason of CN- being a strong ligand, Doct is maximum for this complex among the given options.


Option 1)

\left [ Co(NH_3)_6 \right ]^{3+}

Option 2)

\left [ Co(CN)_6 \right ]^{3-}

Option 3)

\left [ Co(C_2O_4)_3 \right ]^{3-}

Option 4)

\left [ Co(H_2O)_6 \right ]^{3+}

Posted by

prateek

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