The atomic number of V Cr, Mn and Fe are respectively 23, 24,25 and 26.Which one of these may be expected to have the highest second ionisation enthalpy?

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answer is B.

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Detailed Solution

V⊕=3d34s1,Cr⊕=3d5,Mn⊕=3d54s1,Fe⊕=3d64s1Clearly, IE2 of Cr will be highest as Cr⊕ has exactly half filled d-subshell.

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