The stability of +1 oxidation state among $$Al,Ga,In$$ and $$Tl$$ increases in the sequence
A.
$$Ga < In < Al < Tl$$
B.
$$Al < Ga < In < Tl$$
C.
$$Tl < In < Ga < Al$$
D.
$$In < Tl < Ga < Al$$
Answer :
$$Al < Ga < In < Tl$$
Solution :
$$Al < Ga < In < Tl$$
This is due to inert pair effect or tendency of $$n{s^2}$$ electrons do not participate in bond formation. This tendency decreases on moving down the group.
Releted MCQ Question on Inorganic Chemistry >> P - Block Elements
Releted Question 1
The reddish brown coloured gas formed when nitric oxide is oxidised by air is