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

1. Co (Z = 27)
2. Ni (Z = 28)
3. Cu (Z = 29)
4. Fe (Z = 26)

Correct answer: Cu (Z = 29)

Solution

Copper (Cu) has a positive standard reduction potential (E°) due to its high ionization energy and stability of the Cu²⁺ ion, unlike other transition metals in the series.

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