Q.

The third ionization enthalpy is minimum for

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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.
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The third ionization enthalpy is minimum for