AIIMS2005Chemistryd and f Block Elements
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in
Options
- ATl ⁺, Tl ³⁺
- BCu ⁺, Cu ²⁺
- CCr ²⁺, Cr ³⁺
- DV ²⁺, VO ²⁺ .
Correct answer
A. Tl ⁺, Tl ³⁺
Step-by-step solution
Tl ⁺ ions are more stable than Tl ³⁺ and thus, Tl ³⁺ ions change to Tl ⁺ ions thereby acting as oxidising agents. Tl ³⁺ compounds +2 e⁻ Tl ⁺ compounds (less stable, oxidising agent) (more stable, reducing agent)