The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is .

and

Question

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is .

and

Canvas Classes · Accepted Answer

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

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