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Question

Which of the following oxidation state is common for all lanthanoids?

A
2
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B
3
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C
4
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D
5
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Solution

The correct option is A 3
[Xe]4fn6s2 is the general configuration of Lanthanoids,it may seem +2 should be the common oxidation state but relative stability depends on other factors as well,Landthanoids most commonly shows +3 oxidation state due to high hydration enthalpy than of +2 oxidation state.

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