Q.

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

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a

Availability of 4f electrons results in the formation of compounds in +4 state for 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. 

answer is C.

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Detailed Solution

The common oxidation state of lanthanoids is +3. Some of the lanthanoids also show +2 and +4 oxidation state but they easily revert to the more stable +3 state

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