Which of the following has least tendency to liberate H2 from mineral acids?
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
Which of the following has least tendency to liberate from mineral acids?
- a✓
Cu
- b
Mn
- c
Ni
- d
Zn
Cu
Concept: Electrode Potential and H₂ Liberation
A metal liberates from mineral acids only if its is negative (lies above H in electrochemical series).
| Metal | (V) | Liberates H₂? | |-------|----------|----------------| | Zn | | Yes ✓ | | Mn | | Yes ✓ | | Ni | | Yes ✓ | | Cu | | No ✗ |
Cu has a positive , so it cannot displace from dilute mineral acids.
Answer: Option (1) — Cu
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