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Question

Which one of the follwing is stable oxidation state of Tl?

A
1
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B
3
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C
2
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D
(b) and (c) above.
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Solution

The correct option is A 1
In Ga, In and Tl, both +1 and +3 oxidations states are observed but +1 oxidations state of Tl is relative more stable.
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.
Hence correct option is a.

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