Four successive members of the first ser...

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

`Ni(Z=28)`

`Cu(Z=29)`

`Fe(Z=26)`

`Co(Z=27)`

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To determine which of the four successive members of the first series of transition metals has a positive standard electrode potential `(E_(M^(2+)//M)^(@))`, we need to analyze the given metals: Nickel (Ni), Copper (Cu), Iron (Fe), and Cobalt (Co). ### Step-by-Step Solution: 1. **Identify the Metals and Their Electrode Potentials**: - Nickel (Ni): `E = -0.25 V` - Copper (Cu): `E = +0.34 V` - Iron (Fe): `E = -0.44 V` - Cobalt (Co): `E = -0.28 V` 2. **Compare the Electrode Potentials**: - We need to look for the metal with a positive standard electrode potential. - The values are: - Ni: `-0.25 V` - Cu: `+0.34 V` - Fe: `-0.44 V` - Co: `-0.28 V` 3. **Identify the Positive Value**: - Among the listed values, only Copper (Cu) has a positive standard potential of `+0.34 V`. 4. **Conclusion**: - Therefore, the metal for which the standard potential `(E_(M^(2+)//M)^(@))` has a positive sign is **Copper (Cu)**. ### Final Answer: The correct option is **B. Copper**. ---

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