question_answer

Which of the following has more unpaired \[d\]-electrons [CBSE PMT 1999]

A)                 \[Z{{n}^{+}}\]   

B)                 \[F{{e}^{2+}}\]

C)                 \[{{N}^{3+}}\]   

D)                 \[C{{u}^{+}}\]

Correct Answer: B

Solution :

           \[F{{e}^{2+}}\,[Ar]\,3{{d}^{6}}4{{s}^{0}}\] \[F{{e}^{2+}}\]consist of maximum 4 unpaired electrons.