question_answer

What is the correct electronic configuration of the central atom in \[{{K}_{4}}\left[ Fe{{(CN)}_{6}} \right]\]based on crystal field theory?                        [NEET 5-5-2019]

A) \[{{e}^{3}}t_{2}^{3}\]                      

B) \[{{e}^{4}}t_{2}^{2}\]

C) \[t_{2g}^{4}e_{g}^{2}\]                    

D) \[t_{2g}^{6}e_{g}^{0}\]

Correct Answer: D

Solution :

\[{{K}_{4}}\left[ Fe{{(CN)}_{6}} \right]\] has \[F{{e}^{+2}}=\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{ }3{{d}^{6}}\]