Question

Why the standard reduction potential of Zn and Mn are more Negative?​

Answer 1

Hey there mate here is your answer

Metals will easily lose electrons and oxidized.

Negative electrode potential value means oxidized species is more stable than reduced species.

Manganese and Zinc have half filled and completely filled orbitals. It gives them stability and not get reduced.

Therefore the value of standard electrode potential of Manganese and Zinc is more negative

Thanks...