question_answer

Generally the +3 oxidation state is

A)  Ni (28)           

B)  Fe (26)

C)  Zn (30)          

D)  Cu (29)

Correct Answer: B

Solution :

 [a] \[Ni(III)=3{{d}^{7}}\,4{{s}^{0}}\] [b] \[Fe(III)=3{{d}^{5}}4{{s}^{0}}\] The +3 oxidation state of Fe is stable due to half-filled d-subshell. [c] \[Zn(III)=3{{d}^{9}}4{{s}^{0}}\] [d] \[Cu(III)=3{{d}^{8}}4{{s}^{0}}\]