Among and ions, one if used as a reagent cannot liberate from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is B.M. (Nearest integer)

Question

Among  and  ions, one if used as a reagent cannot liberate  from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is  B.M. (Nearest integer)

Canvas Classes · Accepted Answer

Step 1: Identify the ion that CANNOT liberate H₂

An ion liberates H₂ if it is a reducing agent (negative ). An ion that cannot liberate H₂ must be an oxidising agent (positive ).

| Ion | Config |  | Liberates H₂? |
|-----|--------|------|----------------|
|  |  |  V | No — strong oxidiser ✓ |
|  |  |  V | Yes |
|  |  |  V | Yes |
|  |  |  V | Yes |

cannot liberate H₂ — it is a strong oxidising agent.

Step 2: Magnetic moment of

:  (in gaseous state = high-spin)

Answer: 5

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