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The correct order of stability of +1 oxidation state of Group-13- elements follows :
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a
Al < Ga
b
Tl < In < Ga < Al
c
Al < Ga < In < Tl
d
Ga < Al < In < Tl
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Correct option is C
The common oxidation states of Group-13-elements are +3 and +1 Down the group stability of ‘+1’ oxidation state of elements gradually increases For example, ‘+1’ oxidation state of Thallium is more stable than ‘+3’ oxidation state. The phenomenon is referred to as inert pair effect.
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General electronic configuration of 13 group elements
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