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

B

All the members exbibit +3 oxidation state

C

Because of similar properties the separation of lanthanoids is not easy

D

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

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The correct Answer is:
D
Formation of +4 oxidation state requires very high energy, thus incorrect.
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