General Properties of Lanthanoids

What are the oxidation states shown by Lanthanoids in their oxides?

Among $\mathrm{Ce}\left(4{\mathrm{f}}^{1}5{\mathrm{d}}^{1}6{\mathrm{s}}^2\right), Nd\left(4{\mathrm{f}}^{1}6{\mathrm{s}}^2\right), \mathrm{Eu}\left(4{\mathrm{f}}^{7}6{\mathrm{s}}^2\right)$ and $\mathrm{Dy}\left(4{\mathrm{f}}^{10}6{\mathrm{s}}^2\right)$, the elements having highest and lowest $3$rd ionisation energies, respectively are

Anti-penultimate electronic configuration of a trivalent lanthanide ion is 4f³ and has similar colour in aqueous solution as another trivalent lanthanide ion having anti-penultimate electronic configuration of

Cerium $\left(\mathrm{Z}=\text{58}\right)$ is a member of the lanthanoids. Identify the incorrect statements about cerium from the following

Which of the following ions show colour:

Which statement is incorrect with reference to inner transition elements?

Which one of the following lanthanide ions does not exhibit paramagnetism?

Which one of the following lanthanide ions does not exhibit paramagnetism?

Which one of the following lanthanide ions does not exhibit paramagnetism?

What is the percentage of lanthanides and iron in Misch metal respectively?

Which lanthanoid compound is used as pigment?

Lanthanoid contraction is caused due to

Which of the following statements is incorrect?

Which statements among the following are correct?

I. $\mathrm{C}{\mathrm{e}}^{+4}$ is an oxidizing agent & colourless.

II. $\mathrm{L}{\mathrm{u}}^{3+}$ is colourless.

III. Actinoids exhibit a higher number of oxidation states than lanthanoids.

IV. All 3d elements give ${\mathrm{H}}_2$ with 1 M HCl.

Rare-earth elements are exhibited by

Which lanthanide compound is used as a pigment?

Which of the following lanthanide is commonly used?

 In context of the lanthanoids, which of the following statement is not correct?

Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?