The element which shows only one oxidation state other than its elemental form is:
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
The element which shows only one oxidation state other than its elemental form is:
- a
Cobalt
- b
Titanium
- c
Nickel
- d✓
Scandium
Scandium
Concept: Variable Oxidation States
| Element | Config | Oxidation States | |---------|--------|------------------| | Co (Z=27) | [Ar] | +2, +3 | | Ti (Z=22) | [Ar] | +2, +3, +4 | | Ni (Z=28) | [Ar] | +2, +3 | | Sc (Z=21) | [Ar] | +3 only |
Sc loses all 3 electrons to achieve the stable noble gas configuration. It cannot show any other positive oxidation state. Hence it shows only +3 — a single oxidation state other than 0.
Answer: Option (4) — Scandium
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