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p-Block Elements - I
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The stability of $+ 1$ oxidation state among $Al,Ga, In$ and $Tl$ increases in the sequence
A
$Al < Ga < In < Tl$
B
$Tl < In < Ga < Al$
C
$In < Tl < Ga < Al$
D
$Ga < In < Al < Tl$
(AIPMT-2009) (NEET-2015)
Solution
$\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{TI}$
This is due to inert pair effect or tendency of $ns^2$ electrons do not participate in bond formation. This tendency decreases on moving down the group.
Standard 11
Chemistry
