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Question:

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

Ni(Z=28)

Cu(Z=29)

Co(Z=27)

Fe(Z=26)

Solution:

In the electrochemical series, Cu is below hydrogen. Hence, it has a positive value of standard reduction potential (E°M²/M). The standard reduction potentials are given below.