In context of the lanthanoids, which of the following statements is not correct?

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Because of similar properties the separation of lanthanoids is not easy

Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series

There is a gradual decrease in the radii of the members with increasing atomic number in the series

AH the members exhibit +3 oxidation state

answer is B.

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Detailed Solution

Since they are all members of the same group, lanthanides have a lot of characteristics.
Since the 5d and 6s orbitals of lanthanides provide adequate shielding, the 4f subshell electrons are not involved in bonding.
Due to the inadequate shielding effect of the f subshell, the radius of lanthanides steadily decreases as atomic number increases.
Hence, the oxidation state of lanthanides is typically +3.

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