Test: Lanthanide- 2 - Chemistry MCQ

Magnet ic moment (μ) in BM of Pr³⁺ with outer electronic configuration is:

The stability order of +2 oxidation state is:

The order of the basicity of the fo llowing is correct:

Which of the followings are colourless:

Ce³⁺ and Yb³⁺ are colourless but show strong absorption in UV region. This is due to:

The calculated ground state magnetic moment of Sm³⁺ at room temperature is:

Lanthanides are used for wavelength calibration of instruments because:

(I) f-orbitals are deep inside the atom.
(II) The absorption bands are sharp.
(III) Charge transfer spectra is possible.

The correct statements is/are

Match coordination number and shape with most probable example, of lanthanide ion choose the correct answer using the codes given below:

Which of the following compounds show a charge-transfer band:

The actual magnetic moment shows a large deviation from the spin-only formula in the case of:

The least basic among the following is:

The 3d element show variable oxidation states. What is the maximum oxidation state shown by the element Mn?

The metallic radii are abnormally high for which of the following pairs:

Among the following statements, ident ify the correct ones for complexes of lanthanide (III) ion:

Statement I: The size of Zr and Hf are similar
Statement II: Size of Hf is affected by lanthanide contraction.

The coordination number and geometry of cerium in [Ce(NO₃)₆]^2– are respectively:

The pair of lanthanides with the highest third-io nization energy is:

The lanthanide(III) ion having the highest partition coefficient between tri-n-but ylphosphate and conc. HNO₃ is:

Consider the ions Eu(III), Gd(III), Sm(III) and Lu(III). The observed and calculated magnetic moment values are closest for the pair:

Consider the following statements with respect to uranium:

(I) UO²⁺ disproportionate more easily than
(II) U₃O₈ is its most stable oxide of U
(III) Coordination number of U in [UO₂(NO₃)₂(H₂O)₂].4H₂O is six
(IV) is linear 

The correct set of statements is

Consider the following statements for (NH₄)₂[Ce(NO₃)₆] (Z)

(I) Coordination number of Ce is 12
(II) Z is paramagnetic
(III) Z is an oxidizing agent
(IV) Reaction of Ph₃PO with Z gives a complex having coordination number 10 for Ce.

The correct statements are

For uranocene, the correct statement(s) is/are:

(I) Oxidation state of uranium is ‘+4’
(II) It has cyclooctatetraenide ligands
(III) It is a bent sandwich compound
(IV) It has ‘–2’ charge

Correct answer is

Which of the following statements are true for the lanthanides:

(I) The observed magnetic moment of Eu³⁺ at room temperature is higher than that calculated form spin-orbit coupling.
(II) Lanthanide oxides are predominantly acidic in nature.
(III) The stability of Sm(II) is due to its half-filled sub-shell
(IV) Lanthanide(III) ions can be separated by ion exchange chromatography Correct answer is

The lanthanide complex (acec = acet ylacetonate; phen = 1, 10-phenanthroline that do not have square antiprismatic structure is:

The difference in the measured and calculated magnetic moment (based on spin-orbit coupling) is observed for:

The separation of trivalent lanthanide ions, Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺ can be effectively done by a cation exchange resin using ammonium o-hydroxy isobutyrate as the eluent. The order in which the ions will be separated is:

The calculated and observed magnetic moments differ considerably for an aqua complex of a lanthanide(III) ion as a result of low lying states of high J. The ion, among the following, is: