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(A) The inert pair effect is the tendency of the two electrons in the outermost $s$-orbital to remain unshared in compounds of post-transition metals.

Vedclass · Accepted Answer

$B < Al < Ga < In < Tl$

Vedclass · Answer

(A) The inert pair effect is the tendency of the two electrons in the outermost $s$-orbital to remain unshared in compounds of post-transition metals. This effect increases as we move down a group in the $p$-block elements. For Group $13$ elements $(B, Al, Ga, In, Tl)$,the stability of the $+1$ oxidation state increases down the group due to the inert pair effect. Therefore,the tendency to show the inert pair effect follows the order: $B < Al < Ga < In < Tl$.

Which of the following represents the correct order of the inert pair effect?

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