The electrode potential of M2+/M of 3d-series elements shows positive value for:
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
The electrode potential of of 3d-series elements shows positive value for:
- a
Co
- b
Fe
- c
Zn
- d✓
Cu
Cu
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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