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

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By Expert Faculty of Sri Chaitanya
a
Tl
b
In
c
Ga
d
Al
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detailed solution

Correct option is D

Due to the inert pair effect, group 1 3 elements show + I oxidation state also besides the group oxidation state +3, and the stability of lower oxidation state, i.e. +1, increases down the group (↓).


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