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a
Fe
b
Ni
c
Co
d
Mn
answer is A.
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Detailed Solution
Electronic conhquration of 25Mn 26Fe 27Co 28NI M=[Ar]3d54s2 [Ar]3d64s2 [Ar]3d74s2 [Ar]3d84s2M2+=[Ar]3d54s0[Ar]3d64s0 [Ar]3d74s0 [Ar]3d84s0So third ionisation energy is minimum for Fe.