The electrode potential of of 3d-series elements shows positive value for:

Question

The electrode potential of  of 3d-series elements shows positive value for:

Canvas Classes · Accepted Answer

Standard reduction potentials  for 3d metals:

| Metal |  (V) | Positive? |
|-------|---------------------|----------|
| Co |  | No |
| Fe |  | No |
| Zn |  | No |
| Cu |  | Yes ✓ |

Cu is the only first-row transition metal with a positive  value.

This means Cu²⁺ is more easily reduced to Cu than H⁺ is reduced to H₂ — hence Cu does not dissolve in dilute acids and cannot liberate H₂.

Answer: Option (4) — Cu

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