JEE Main Chemistry question

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 exhibit oxidation state.
(C)Because of similar properties the separation of lanthanoids is not easy.
(D)Availability of -electrons results in the formation of compounds in state for all members of the series.Correct

Answer: (D)

Solution

Only a few lanthanoids (notably Ce, Pr, Tb) can be pushed to the state, and this requires very high energy; it is not a general feature available to "all members of the series," making statement (d)

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Question ID VK-147369