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In context of the lanthanoids, which of ...

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

A

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

B

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

C

All the members exhibit +3 oxidation state

D

Because of similar properties the separation of lanthanoids is not easy

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The correct Answer is:
A
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