question_answer

The atomic numbers of vanadium\[(V)\], chromium\[(Cr)\], manganese \[(Mn)\] and iron \[(Fe)\] are respectively \[23,\,\,24,\,\,25\] and\[26\]. Which one of these may be expected to have the highest second ionisation enthalpy?

A) \[V\]                                     

B)        \[Cr\]

C)        \[Mn\]                                 

D)        \[Fe\]

Correct Answer: B

Solution :

This is stable\[EC\], hence formation of \[C{{r}^{2+}}\] by second \[IP\] requires maximum enthalpy.