IN context of the lanthanoids, which of ...

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

Because of similar properties the seperation 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.

All the members exhibit +3 oxidation state.

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The correct Answer is:

The common oxidation state of lanthanoids is +3.

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