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AIIMS 2005
Exam
AIIMS
Year
2005
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2005 · Chemistry · d and f Block Elements

Among the following pairs of ions, the lower oxidation state in...

Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in

Options

  1. ATl+,Tl3+\mathrm{Tl}^{+}, \mathrm{Tl}^{3+}
  2. BCu+,Cu2+\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}
  3. CCr2+,Cr3+\mathrm{Cr}^{2+}, \mathrm{Cr}^{3+}
  4. DV2+,VO2+\mathrm{V}^{2+}, \mathrm{VO}^{2+}.

Correct answer

A. Tl+,Tl3+\mathrm{Tl}^{+}, \mathrm{Tl}^{3+}

Step-by-step solution

Tl+\mathrm{Tl}^{+}ions are more stable than Tl3+\mathrm{Tl}^{3+} and thus, Tl3+\mathrm{Tl}^{3+} ions change to Tl+\mathrm{Tl}^{+}ions thereby acting as oxidising agents. Tl3+\mathrm{Tl}^{3+} compounds +2e−→Tl++2 e^{-} \rightarrow \mathrm{Tl}^{+}compounds (less stable, oxidising agent) (more stable, reducing agent)
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