The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____. Ti2+,\,…
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____.
and
- a
2
- b✓
3
- c
1
- d
0
3
Concept: Liberation of H₂ from dilute acid
An ion liberates from dilute acid if it is a strong enough reducing agent — i.e., it can reduce to .
This requires the standard reduction potential to be negative (or sufficiently low).
Checking each ion:
| Ion | M²⁺ Config | (V) | Liberates H₂? | |-----|------------|----------|----------------| | | | | Yes ✓ | | | | | Yes ✓ | | | | | Yes ✓ |
All three ions have negative reduction potentials and can act as reducing agents to liberate from dilute acids.
Answer: Option (2) — 3
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