Among the following pairs of ions,the lower o | vedclass

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(A) In the case of $Tl$ (Thallium),the $Tl^{+}$ ion is more stable than the $Tl^{3+}$ ion due to the inert pair effect,where the $6s^{2}$ electrons ar

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$Tl^{+}, Tl^{3+}$

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(A) In the case of $Tl$ (Thallium),the $Tl^{+}$ ion is more stable than the $Tl^{3+}$ ion due to the inert pair effect,where the $6s^{2}$ electrons are reluctant to participate in bonding.Consequently,$Tl^{3+}$ acts as a strong oxidizing agent and gets reduced to $Tl^{+}$:$Tl^{3+} + 2e^{-} 	o Tl^{+}$In contrast,for $Cu$,$Cr$,and $V$,the higher oxidation states ($Cu^{2+}$,$Cr^{3+}$,$VO^{2+}$) are generally more stable in aqueous solution due to higher hydration energy or electronic configuration stability.

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

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