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Question

The stability of +1 oxidation state increases in the sequence:

Re-AIPMT 2015

A
Al<Ga<In<Tl
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B
In<Tl<Ga<Al
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C
Tl<In<Ga<Al
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D
Ga<In<Al<Tl
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Solution

The correct option is A Al<Ga<In<Tl
The stability of +1 oxidation state among Al,Ga,In and Tl increases in the sequence.
Al<Ga<In<Tl
This is due to inert pair effect due to which, on moving down the group, the stability of +3 oxidation state decreases while the stability of +1 oxidation state increases.

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