In context of the lanthanoids, which of the following statements is not correct? (a) Availabilit...

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In context of the lanthanoids, which of the following statements is not correct?
(a) Availability of \( 4 f \) electrons results in the formation of compounds in \( +4 \) state for all the
\( P \) members of the series
(b) There is a gradual decrease in the radii of the members with increasing atomic number in W 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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