Which of the following statements regarding Lanthanides is false?
- AAll lanthanides are solid at room temperature
- BTheir usual oxidation state is $+3$
- CThey can be separated from one another by ion-exchange method
- DIonic radii of trivalent lanthanides steadily increases with increase in atomic number
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View SolutionThe number of $f$-electrons in the $+3$ oxidation state of gadolinium $(Z=64)$ is $x$ and in the $+2$ oxidation state of ytterbium $(Z=70)$ is $y$. The sum of $x$ and $y$ is:
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