In the context of the lanthanoids,which of the following statements is not correct?
- AAvailability of $4f$ electrons results in the formation of compounds in $+4$ state for all the members of the series.
- BThere is a gradual decrease in the radii of the members with increasing atomic number in the series.
- CAll the members exhibit $+3$ oxidation state.
- DBecause of similar properties,the separation of lanthanoids is not easy.
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