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The E⁺ values for Mn and Zn are more negative than expected because

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it is Quite easy to remove electrons from their orbitals

none of the above

they have half-filled configurations and fullfilled configuration

they can easily donate electrons

answer is A.

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Detailed Solution

The values of standard electrode potentials for Mn and Zn are more negative than expected.

The reason behind this is that they have exactly half-filled and fully-filled configurations.

₂₅Mn:[Ar]3d⁵4s²

₃₀Zn:[Ar]3d¹⁰4s²

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