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Q.

Which of the following is the most stable oxidation state of Thallium?

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a

-1

b

+2

c

+3

d

+1

answer is D.

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Detailed Solution

Thallium can exists in +1, and +3 oxidation state but thallium in +1 state most stable due to‘Inert pair effect ‘. The Non- Partispation (Reluctance) of ns-electrons in chemical bonds is called inert Pair effect. Due to inert pair effect TlCl is most stable than TlCl3
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