[Availability of 4 f elect...] In context of the lanthanoids, which of the following statements is not correct?

For Competitive Exams

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

Availability of 4 f 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

All the members exhibit +3 oxidation state

Because of similar properties the separation of lanthanoids is not easy

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