Four successive members of the first series of the transition metals

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E⁰ M²⁺/M) value has a positive sign

Options

(a) Co (Z = 27)
(b) Ni (Z = 28)
(c) Cu (Z = 29)
(d) Fe (Z = 26)

Correct Answer:

Cu (Z = 29)

Explanation:

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