A) Availability of 4f electrons results in the formation of compounds in \[+4\] state for all the members of the series
B) There is a gradual decrease in the radii of the members with increasing atomic number in the series
C) All the members exhibit \[+3\] oxidation state
D) Because of similar properties the separation of lanthanoids is not easy
Correct Answer: A
Solution :
Lanthanoid generally show the oxidation state of\[+3\].
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