List of top Chemistry Questions on The Lanthanoids

Which trend is correct regarding ionic radius in the 4f-series (lanthanides)?
Which of the following ion is colourless inspite of the presence of unpaired electrons?
Number of colourless lanthanoid ions among the following is ____.
\[ \text{Eu}^{3+}, \, \text{Lu}^{3+}, \, \text{Nd}^{3+}, \, \text{La}^{3+}, \, \text{Sm}^{3+} \]
Which one of the lanthanoids given below is the most stable in divalent form?

The correct order of basicity of oxides of vanadium is

The ′f′ orbitals are half and completely filled, respectively in lanthanide ions
[Given: Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]
Which one of the lanthanoids given below is the most stable in divalent form?
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
The lanthanide ion that would show colour is-
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
The pair that has similar atomic radii is :
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
Which of the following pairs has the same size?