MEDIUMMCQ SINGLENEET ChemistryInorganic Chemistryp-Block (group 13 and 14)Previous Year Questions

The stability of +1 oxidation state increases in the sequence (AIPMT 2009)

A.Al < Ga < In < Tl✓ Correct

B.Tl < In < Ga < Al

C.In < Tl < Ga < Al

D.Ga < In < Al < Tl

Explanation

These all elements belong to group 13 i.e. Boron family. In this group, due to inert pair effect the stability of +3 oxidation state decreases down the group while that of +1 oxidation state increases down the group. Thus, the stability of +1 oxidation state increases down the group in the order Al < Ga < In < Tl. Hence, the correct option is (a).

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