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Question: Answered & Verified by Expert
Relative stability orders of $+1,+3$ oxidation states of $\mathrm{Ga}$, In, $\mathrm{T} 1$ are respectively
ChemistryChemical Bonding and Molecular StructureAP EAMCETAP EAMCET 2023 (19 May Shift 1)
Options:
  • A $\mathrm{Tl}^{+}>\mathrm{In}^{+}>\mathrm{Ga}^{+}, \mathrm{Ga}^{3+}>\mathrm{In}^{3+}>\mathrm{Tl}^{3+}$
  • B $\mathrm{Ga}^{+}>\mathrm{In}^{+}>\mathrm{Tl}^{+}, \mathrm{Tl}^{3+}>\mathrm{In}^{3+}>\mathrm{Ga}^{3+}$
  • C $\mathrm{Ga}^{+}>\mathrm{In}^{+}>\mathrm{Tl}^{+}, \mathrm{Ga}^{3+}>\mathrm{In}^{3+}>\mathrm{Tl}^{3+}$
  • D $\mathrm{Tl}^{+}>\mathrm{In}^{+}>\mathrm{Ga}^{+}, \mathrm{Tl}^{3+}>\mathrm{In}^{3+}>\mathrm{Ga}^{3+}$
Solution:
2040 Upvotes Verified Answer
The correct answer is: $\mathrm{Tl}^{+}>\mathrm{In}^{+}>\mathrm{Ga}^{+}, \mathrm{Ga}^{3+}>\mathrm{In}^{3+}>\mathrm{Tl}^{3+}$
Due to inert pair effect, the stability of +1 state in group 13 elements increases down the group. Opposite trend is observed for +3 state stability.

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