A) \[3{{d}^{3}},\,4{{s}^{2}}\]
B) \[3{{d}^{5}},\,4{{s}^{1}}\]
C) \[3{{d}^{5}},\,4{{s}^{2}}\]
D) \[3{{d}^{2}},\,\,4{{s}^{2}}\]
Correct Answer: C
Solution :
Key Idea Number of oxidation states exhibited by d-block elements is the sum of number of electrons (unpaired) in d-orbitals and number of electrons in s-orbital. \[15\,\Omega \] \[240\,\Omega \] \[15\,\Omega \] \[{{T}_{1}}\] Hence, element with \[{{T}_{2}}({{T}_{1}}>{{T}_{2}}).\] configuration exhibits largest number of oxidation states.
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