Four successive members of the first series of the transition metals are listed below. For which...

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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 \( \left(E_{M^{2+} / M}^{\circ}\right) \) value has a positive sign?
\( P \)
(AIPMT (Mains) 2012)
W.
(a) \( \operatorname{Co}(Z=27) \)
(b) \( \mathrm{Ni}(Z=28) \)
(c) \( \mathrm{Cu}(Z=29) \)
(d) \( \mathrm{Fe}(Z=26) \)
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