Inner Transition Elements

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JEE Main 2025

The pair(s) of diamagnetic ions is(are)

La^{3 +}, Ce^{4 +}

(B)

Yb^{2 +}, Lu^{3 +}

(C)

La^{2 +}, Ce^{3 +}

(D)

Yb^{3 +}, Lu^{2 +}

JEE Main 2005

LEVELJEE Main

Which of the following factors may be regarded as the main cause of lanthanide contraction?

(A)

Greater shielding of

5 d

electron by

4 f

electrons

(B)

Poorer shielding of

5 d

electron by

4 f

electrons

(C)

Effective shielding of one of

4 f

electron by another in the subshell

(D)

Poor shielding of one of

4 f

electron by another in the subshell

JEE Main 2020

LEVELJEE Main

The atomic radius of Ag is closest to

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

(A)

There is a gradual decrease in the radii of the members with increasing atomic number in the series.

(B)

All the member exhibit

+ 3

4 f

electrons results in the formation of compounds in

+ 4

state for all the members of the series.

JEE Main 2021

LEVELJEE Main

The $Eu^{2 +}$ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

(A)

4 f^{7} 6 s^{2}

(B)

4 f^{6}

(C)

4 f^{7}

(D)

4 f^{6} 6 s^{2}

JEE Main 2021

LEVELJEE Main

Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers $Ce = 58$ , $Gd = 64$ and $Eu = 63$ .) A. $(NH_{4})_{2} [Ce (NO_{3})_{6}]$ B. $Gd (NO_{3})_{3}$ and C. $Eu (NO_{3})_{3}$

Most common oxidation states of Ce (Cerium) are

The number of $f$ -electrons in the ground state electronic configuration of Np ( $Z = 93$ ) is …… . (Nearest integer)

LEVELJEE Main

Lanthanoid contraction is caused due to

(A)

the appreciable shielding on outer electrons by

4 f

electrons from the nuclear charge

(B)

the appreciable shielding on outer electrons by

5 d

electrons from the nuclear charge

(C)

the same effective nuclear charge from Ce to Lu

(D)

the imperfect shielding on outer electrons by

4 f

electrons from the nuclear charge

LEVELJEE Main

The outer electron configuration of Gd (At. no. 64) is

(A)

4 f^{3}, 5 d^{5}, 6 s^{2}

(B)

4 f^{8}, d^{0}, 6 s^{2}

(C)

4 f^{4}, 5 d^{4}, 6 s^{2}

(D)

4 f^{7}, 5 d^{1}, 6 s^{2}

JEE Main 2019

LEVELJEE Main

The highest possible oxidation states of uranium and plutonium, respectively, are

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means

(A)

increase in atomic radii and decrease in ionic radii

(B)

decrease in both atomic and ionic radii

(C)

increase in both atomic and ionic radii

(D)

decrease in atomic radii and increase in ionic radii

JEE Main 2020

LEVELJEE Main

The correct electronic configuration and spin-only magnetic moment (BM) of $Gd^{3 +}$ ( $Z = 64$ ), respectively, are

(A)

[Xe] 4 f^{7}

and

7.9

(B)

[Xe] 5 f^{7}

and

7.9

(C)

[Xe] 5 f^{7}

and

8.9

(D)

[Xe] 4 f^{7}

and

8.9

JEE Main 2020

LEVELJEE Main

The lanthanoid that does not show $+ 4$ oxidation state is

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) Size of $Bk^{3 +}$ ion is less than $Np^{3 +}$ ion. Reason (R) The above is a consequence of the lanthanoid contraction. In the light of the above statements, choose the correct answer from the options given below

(A)

A is false but R is true.

(B)

Both A and R are true but R is not the correct explanation of (A)

(C)

Both A and R are true and R is the correct explanation of (A)

(D)

A is true but R is false.

JEE Main 2021

LEVELJEE Main

Given below are two statements. Statement I The $E^{\circ}$ value of $C e^{4 +} / C e^{3 +}$ is $+ 1.74 V$ . Statement II Ce is more stable in $C e^{4 +}$ state than $C e^{3 +}$ state. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)

Both statement I and statement II are correct.

(B)

Statement I is incorrect but statement II is correct.

(C)

Both statement I and statement II are incorrect.

(D)

Statement I is correct but statement II is incorrect.

JEE Main 2020

LEVELJEE Main

Mischmetal is an alloy consisting mainly of

(A)

lanthanoid metals

(B)

actinoid and transition metals

(C)

lanthanoid and actinoid metals

Which one of the following lanthanides exhibits $+ 2$ oxidation state with diamagnetic nature ? (Given, $Z$ for $Nd = 60$ , $Yb = 70$ , $La = 57$ , $Ce = 58$ )

(A)

Nd

(B)

Yb

(C)

La

(D)

Ce

LEVELJEE Main

Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

(A)

Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character

(B)

The ionic sizes of Ln (III) decrease in general with increasing atomic number

(C)

Ln (III) compounds are generally colourless

(D)

Ln (III) hydroxide are mainly basic in character

LEVELJEE Main

Larger number of oxidation states are exhibited by the actinoides than those by the lanthanoides, the main reason being

(A)

4f orbitals more diffused than the 5f orbitals

(B)

lesser energy difference between 5f and 6d than between 4f and 5d orbitals

(C)

more energy difference between 5f and 6d than between 4f and 5d orbitals

(D)

more reactive nature of the actinoides than the lanthanoides

JEE Main 2020

LEVELJEE Main

The electronic configuration of bivalent europium and trivalent cerium are (atomic number : $Xe = 54, Ce = 58, Eu = 63$ )

(A)

[Xe] 4 f^{7}

and

[Xe] 4 f^{1}

(B)

[Xe] 4 f^{7} 6 s^{2}

and

[Xe] 4 f^{2} 6 s^{2}

(C)

[Xe] 4 f^{2}

and

[Xe] 4 f^{7}

(D)

[Xe] 4 f^{4}

and

[Xe] 4 f^{9}

LEVELJEE Main

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

(A)

The common oxidation states of cerium are

+ 3

and

+ 4

(B)

The

+ 3

oxidation state of cerium is more stable than the

+ 4

oxidation state

(C)

The

+ 4

oxidation state of cerium is not known in solutions

(D)

Cerium (IV) acts as an oxidising agent

LEVELJEE Main

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because

(A)

the 5f orbitals are more buried than the 4f orbitals

(B)

(C)

the actinoids are more reactive than the lanthanoids

(D)

the 5f orbitals extend farther from the nucleus than the 4f orbitals

JEE Main 2021

LEVELJEE Main

The number of $4 f$ electrons in the ground state electronic configuration of $Gd^{2 +}$ is ...... . [Atomic number of Gd is 64.]

LEVELJEE Main

The radius of $La^{3 +}$ (atomic number : $La = 57$ ) is $1.06 \overset{˚}{A}$ . Which one of the following given values will be closest to the radius of $Lu^{3 +}$ (atomic number : $Lu = 71$ ) ?

(A)

1.60 \overset{˚}{A}

(B)

1.40 \overset{˚}{A}

(C)

1.06 \overset{˚}{A}

(D)

0.85 \overset{˚}{A}

The pair(s) of diamagnetic ions is(are)

Which of the following factors may be regarded as the main cause of lanthanide contraction?

The atomic radius of Ag is closest to

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

Most common oxidation states of Ce (Cerium) are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of f-electrons in the ground state electronic configuration of Np (Z=93) is …… . (Nearest integer)

Lanthanoid contraction is caused due to

The outer electron configuration of Gd (At. no. 64) is

The highest possible oxidation states of uranium and plutonium, respectively, are

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z=64), respectively, are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The lanthanoid that does not show +4 oxidation state is

Mischmetal is an alloy consisting mainly of

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given, Z for Nd=60, Yb=70, La=57, Ce=58)

Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

Larger number of oxidation states are exhibited by the actinoides than those by the lanthanoides, the main reason being

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The electronic configuration of bivalent europium and trivalent cerium are (atomic number : Xe=54,Ce=58,Eu=63)

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Cerium (Z=58) is an important member of the lanthanides. Which of the following statements about cerium is incorrect?

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of 4f electrons in the ground state electronic configuration of Gd2+ is ...... . [Atomic number of Gd is 64.]

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The radius of La3+ (atomic number : La=57) is 1.06 A˚. Which one of the following given values will be closest to the radius of Lu3+ (atomic number : Lu=71) ?

The $Eu^{2 +}$ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

The number of $f$ -electrons in the ground state electronic configuration of Np ( $Z = 93$ ) is …… . (Nearest integer)

The correct electronic configuration and spin-only magnetic moment (BM) of $Gd^{3 +}$ ( $Z = 64$ ), respectively, are

The lanthanoid that does not show $+ 4$ oxidation state is

Which one of the following lanthanides exhibits $+ 2$ oxidation state with diamagnetic nature ? (Given, $Z$ for $Nd = 60$ , $Yb = 70$ , $La = 57$ , $Ce = 58$ )

The electronic configuration of bivalent europium and trivalent cerium are (atomic number : $Xe = 54, Ce = 58, Eu = 63$ )

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

The number of $4 f$ electrons in the ground state electronic configuration of $Gd^{2 +}$ is ...... . [Atomic number of Gd is 64.]

The radius of $La^{3 +}$ (atomic number : $La = 57$ ) is $1.06 \overset{˚}{A}$ . Which one of the following given values will be closest to the radius of $Lu^{3 +}$ (atomic number : $Lu = 71$ ) ?