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Four successive members of the first ser...

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential `(E_(M^(2+)//M)^(@))` value has a positive sign

A

`Mn(Z=25)`

B

`Fe(Z=26)`

C

`Co(Z=27)`

D

`Cr(Z=24)`

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The correct Answer is:
C
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