First slide

13th group or boron group

Question

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

Easy

A

-1
B

+2
C

+3
D

+1

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 ${TlCl}_{3}$

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