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.