Which of the following statements is wrong regarding lanthanoids?
- A$Ln(III)$ compounds are generally colourless.
- B$Ln(III)$ compounds are predominantly ionic in character.
- CThe ionic size of $Ln(III)$ ions decreases with increasing atomic number.
- D$Ln(III)$ hydroxides are mainly basic in nature.
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$(A)$ The covalent properties of the Lanthanide metal hydroxides increase from $La$ to $Lu$.
$(B)$ The chemical reactivity decreases from $La$ to $Lu$.
$(C)$ $La(OH)_3$ is more basic than $Lu(OH)_3$.
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$(A)$ The covalent properties of the Lanthanide metal hydroxides increase from $La$ to $Lu$.
$(B)$ The chemical reactivity decreases from $La$ to $Lu$.
$(C)$ $La(OH)_3$ is more basic than $Lu(OH)_3$.
$(D)$ $Zr$ and $Hf$ have about the same radius.
$(E)$ Separation of Lanthanides from one another is easy.
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