In which of the following does the inert pair | vedclass

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(D) The inert pair effect refers to the tendency of the two electrons in the outermost $s$-orbital to remain unshared in compounds of post-transition

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$Tl$

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(D) The inert pair effect refers to the tendency of the two electrons in the outermost $s$-orbital to remain unshared in compounds of post-transition elements. This effect becomes increasingly prominent as we move down a group in the $p$-block elements. Among the given options,$Tl$ (Thallium) belongs to Group $13$. Due to the inert pair effect,the stability of the $+1$ oxidation state increases down the group,making $Tl^+$ more stable than $Tl^{3+}$. Therefore,the inert pair effect is significant in $Tl$.

In which of the following does the inert pair effect play a significant role?

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