Questions
Which of the following is the most stable oxidation state of Thallium?
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By Expert Faculty of Sri Chaitanya
a
-1
b
+2
c
+3
d
+1
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Correct option is D
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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