JEE Main 2011 Chemistry question

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

(1)All the members exhibit +3 oxidation state
(2)Because of similar properties the separation of lanthanoids is not easy.
(3)Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.Correct
(4)There is a gradual decrease in the radii of the members with increasing atomic number in the series.

Answer: (3)

Solution

Only a few lanthanoids (e.g. Ce, Pr, Tb) show a +4 state; it is not

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Question ID VK-039343