General Properties of Lanthanoids

The pair of lanthanides in which both elements have high third-ionization energy is:

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

Number of colourless lanthanoid ions among the
following is _________.

Eu³⁺, Lu³⁺, Nd³⁺, La³⁺, Sm³⁺

How many of the following are colourless?

${\mathrm{La}}^{3+}, {\mathrm{Eu}}^{3+}, {\mathrm{Sm}}^{3+}, {\mathrm{Nd}}^{2+}, {\mathrm{Lu}}^{3+}$

Diamagnetic Lanthanoid ions are:

Given below are two statements:
Statement (I) : In the Lanthanoids, the formation of ${\mathrm{Ce}}^{+4}$ is favoured by its noble gas configuration.
Statement (II) : ${\mathrm{Ce}}^{+4}$ is a strong oxidant reverting to the common $+3$ state.
In the light of the above statements, choose the most appropriate answer from the options given below:

Misch metal is:

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

Which one of the following is the correct increasing order of the magnitude of ionic radii of $\mathrm{C}{\mathrm{e}}^{3+},\mathrm{L}{\mathrm{a}}^{3+},\mathrm{P}{\mathrm{m}}^{3+}$ and $\mathrm{Y}{\mathrm{b}}^{3+}$ ?

Which of the following ions show colour:

Lanthanide contraction is due to

Which of the following statement is wrong regarding lanthanoids?

Which statement is incorrect with reference to inner transition elements?

What is the general molecular formula of the products obtained on heating lanthanoids (Ln) with sulphur?

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?

The percentage of lanthanides and iron, respectively, in Misch metal are