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In context of the lanthanoids, which of ...

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

A

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

B

All menbers exhibit +3 oxidation state.

C

Because of similar properties, the separation of lanthanoids is not easy.

D

A vailiabity of 4f electrons results in the formation of the compounds in +4 state for all the nembers in the series.

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The correct Answer is:
D
The statements is not correct.
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