Lanthanides and Actinides - Inorganic Chemistry - Chemistry Previous Year Questions

1

2013 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2013

The correct electronic configuration and spin only magnetic moment of Gd³⁺ (at. no. 64) are

A

[Xe]4f⁷ and 7.9 BM

B

[Xe]4f⁷ and 8.9 BM

C

[Xe]4f⁶5d¹ and 7.9 BM

D

[Rn]5f⁷ and 7.9 BM

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2

2016 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2016

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

A

Ce\(^{3+}\)

B

Pr\(^{3+}\)

C

Eu\(^{3+}\)

D

Yb\(^{3+}\)

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3

2023 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2023

The calculated magnetic moment of [Ce(NO₃)₅]^2- is _________ BM. (rounded off to two decimal places)
(Given: atomic number of Ce is 58)

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4

2007 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2007

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

A

Pm³⁺

B

Eu³⁺

C

Dy³⁺

D

Lu³⁺

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5

2007 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2007

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

A

Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺

B

Eu³⁺, Dy³⁺, Yb³⁺, Lu³⁺

C

Dy³⁺, Yb³⁺, Eu³⁺, Lu³⁺

D

Yb³⁺, Dy³⁺, Lu³⁺, Eu³⁺

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6

2017 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2017

The lanthanide ion that exhibits color in aqueous solution is

A

La(III)

B

Eu(III)

C

Gd(III)

D

Lu(III)

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7

2018 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2018

Generally, the coordination number and the nature of the electronic absorption band (\(f \to f\) transition) of lanthanide(III) ion in their complexes are, respectively,

A

greater than 6 and sharp

B

6 and broad

C

less than 6 and sharp

D

greater than 6 and broad

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8

2020 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2020

The experimental magnetic moment (3.4 BM) of a hydrated salt of Eu³⁺ at 27 °C is significantly different from the calculated value. The difference is due to
(Given: atomic number of Eu is 63)

A

population of electrons at higher J level(s) via thermal excitation.

B

strong ligand field splitting of f-orbitals.

C

strong spin–orbit coupling.

D

pairing of electrons in f-orbitals.

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9

2021 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2021

The correct statement(s) about actinides is/are:

A

The 5f electrons of actinides are bound less tightly than the 4f electrons.

B

The trans uranium elements are prepared artificially.

C

All the actinides are radioactive.

D

Actinides do not exhibit actinide contraction.

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10

2022 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2022

The calculated magnetic moment (in BM, rounded off to two decimal places) of a \(Ce^{3+}\) complex is

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11

2026 · Chemistry · Inorganic Chemistry · Lanthanides and Actinides

Chemistry (CY) 2026

The pair(s) of lanthanide ions whose ground state term symbols have same spin multiplicity \((2S+1)\) and orbital angular momentum \((L)\), but different spin-orbit coupling \((J)\) is(are) (Given: Atomic number: Nd = 60; Pm = 61; Ho = 67; Er = 68)

A

\(Pm^{3+}\) and \(Ho^{3+}\)

B

\(Nd^{3+}\) and \(Er^{3+}\)

C

\(Pm^{3+}\) and \(Nd^{3+}\)

D

\(Ho^{3+}\) and \(Er^{3+}\)

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