Q.

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

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a

Al

b

Tl

c

In

d

Ga

answer is A.

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Detailed Solution

In group 13 elements, stability of +3 oxidation state decreases down the group while that of +1 oxidation state increases due to inert pair effect. Hence, stability of +1 oxidation state increases in the sequence  : Al < Ga < ln < Tl .
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