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CHXII08:THE D- & F-BLOCK ELEMENTS

321738 Diamagnetic lanthanoid ions are

1

{La}^{3 +}

and

{Ce}^{4 +}

2

{Lu}^{3 +}

and

{Eu}^{3 +}

3

{Nd}^{3 +}

and

{Eu}^{3 +}

4

{Nd}^{3 +}

and

{Ce}^{4 +}

Explanation:

The lanthanoid ions other than the $4 f^{0} ({La}^{3 +}$ and ${Ce}^{4 +})$ and the $4 f^{14}$ type $({Yb}^{2 +}$ and ${Lu}^{3 +})$ are all paramagnetic. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321739 Which of the following statements related to lanthanoids is incorrect?

1 Lanthanoids are silvery white soft metals.

2 Samarium shows +2 oxidation state

3

{Ce}^{+ 4}

solutions are widely used as oxidising agents in titrimetric analysis.

4 Colour of Lanthanoid ion in solution is due to d-d transition .

KCET - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321740 Consider the following statements
(I) $La (OH)_{3}$ is the least basic among hydroxides of lanthanides.
(II) ${Zr}^{4 +}$ and ${Hf}^{4 +}$ possess almost the same ionic radii.
(III) $C e^{4 +}$ can act as an oxidizing agent.
Which of the above is/are true?

1 (I) and (III)

2 (II) and (III)

3 (II) only

4 (I) and (II)

Explanation:

As a result of lanthanoid contraction ${Zr}^{4 +}$ and $H f^{4 +}$ possess almost the same ionic radii. $C e^{4 +}$ is an oxidising agent. $C e^{4 +}$ gains electron to acquire more stable ${Ce}^{3 +}$ state. $La (OH)_{3}$ is the most basic among lanthanide hydroxides.

CHXII08:THE D- & F-BLOCK ELEMENTS

321741 Lanthanide for which $+ II$ and $+ III$ oxidation states are common is

1

La

2

Nd

3

Ce

4

Eu

Explanation:

Lanthanum shows +3 oxidation state.
Cerium shows $+ 3, + 4$ oxidation states
Nd shows $+ 2, + 3, + 4$ , oxidation states
Eu shows $+ 2, + 3$ oxidation states

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321742 Cerium $(Z = 58)$ is an important member of the Lanthanoids. Which of the following statements about cerium is incorrect?

1 The +3 oxidation state of cerium is more stable than the +4 oxidation state.

2 The common oxidation states of cerium are +3 and +4

3 Cerium (IV) acts as an oxidising agent

4 The +4 oxidation state of cerium is not known in solutions.

CHXII08:THE D- & F-BLOCK ELEMENTS

321738 Diamagnetic lanthanoid ions are

1

{La}^{3 +}

and

{Ce}^{4 +}

2

{Lu}^{3 +}

and

{Eu}^{3 +}

3

{Nd}^{3 +}

and

{Eu}^{3 +}

4

{Nd}^{3 +}

and

{Ce}^{4 +}

Explanation:

The lanthanoid ions other than the $4 f^{0} ({La}^{3 +}$ and ${Ce}^{4 +})$ and the $4 f^{14}$ type $({Yb}^{2 +}$ and ${Lu}^{3 +})$ are all paramagnetic. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321739 Which of the following statements related to lanthanoids is incorrect?

1 Lanthanoids are silvery white soft metals.

2 Samarium shows +2 oxidation state

3

{Ce}^{+ 4}

solutions are widely used as oxidising agents in titrimetric analysis.

4 Colour of Lanthanoid ion in solution is due to d-d transition .

KCET - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321740 Consider the following statements
(I) $La (OH)_{3}$ is the least basic among hydroxides of lanthanides.
(II) ${Zr}^{4 +}$ and ${Hf}^{4 +}$ possess almost the same ionic radii.
(III) $C e^{4 +}$ can act as an oxidizing agent.
Which of the above is/are true?

1 (I) and (III)

2 (II) and (III)

3 (II) only

4 (I) and (II)

Explanation:

As a result of lanthanoid contraction ${Zr}^{4 +}$ and $H f^{4 +}$ possess almost the same ionic radii. $C e^{4 +}$ is an oxidising agent. $C e^{4 +}$ gains electron to acquire more stable ${Ce}^{3 +}$ state. $La (OH)_{3}$ is the most basic among lanthanide hydroxides.

CHXII08:THE D- & F-BLOCK ELEMENTS

321741 Lanthanide for which $+ II$ and $+ III$ oxidation states are common is

1

La

2

Nd

3

Ce

4

Eu

Explanation:

Lanthanum shows +3 oxidation state.
Cerium shows $+ 3, + 4$ oxidation states
Nd shows $+ 2, + 3, + 4$ , oxidation states
Eu shows $+ 2, + 3$ oxidation states

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321742 Cerium $(Z = 58)$ is an important member of the Lanthanoids. Which of the following statements about cerium is incorrect?

1 The +3 oxidation state of cerium is more stable than the +4 oxidation state.

2 The common oxidation states of cerium are +3 and +4

3 Cerium (IV) acts as an oxidising agent

4 The +4 oxidation state of cerium is not known in solutions.

CHXII08:THE D- & F-BLOCK ELEMENTS

321738 Diamagnetic lanthanoid ions are

1

{La}^{3 +}

and

{Ce}^{4 +}

2

{Lu}^{3 +}

and

{Eu}^{3 +}

3

{Nd}^{3 +}

and

{Eu}^{3 +}

4

{Nd}^{3 +}

and

{Ce}^{4 +}

Explanation:

The lanthanoid ions other than the $4 f^{0} ({La}^{3 +}$ and ${Ce}^{4 +})$ and the $4 f^{14}$ type $({Yb}^{2 +}$ and ${Lu}^{3 +})$ are all paramagnetic. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321739 Which of the following statements related to lanthanoids is incorrect?

1 Lanthanoids are silvery white soft metals.

2 Samarium shows +2 oxidation state

3

{Ce}^{+ 4}

solutions are widely used as oxidising agents in titrimetric analysis.

4 Colour of Lanthanoid ion in solution is due to d-d transition .

KCET - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321740 Consider the following statements
(I) $La (OH)_{3}$ is the least basic among hydroxides of lanthanides.
(II) ${Zr}^{4 +}$ and ${Hf}^{4 +}$ possess almost the same ionic radii.
(III) $C e^{4 +}$ can act as an oxidizing agent.
Which of the above is/are true?

1 (I) and (III)

2 (II) and (III)

3 (II) only

4 (I) and (II)

Explanation:

As a result of lanthanoid contraction ${Zr}^{4 +}$ and $H f^{4 +}$ possess almost the same ionic radii. $C e^{4 +}$ is an oxidising agent. $C e^{4 +}$ gains electron to acquire more stable ${Ce}^{3 +}$ state. $La (OH)_{3}$ is the most basic among lanthanide hydroxides.

CHXII08:THE D- & F-BLOCK ELEMENTS

321741 Lanthanide for which $+ II$ and $+ III$ oxidation states are common is

1

La

2

Nd

3

Ce

4

Eu

Explanation:

Lanthanum shows +3 oxidation state.
Cerium shows $+ 3, + 4$ oxidation states
Nd shows $+ 2, + 3, + 4$ , oxidation states
Eu shows $+ 2, + 3$ oxidation states

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321742 Cerium $(Z = 58)$ is an important member of the Lanthanoids. Which of the following statements about cerium is incorrect?

1 The +3 oxidation state of cerium is more stable than the +4 oxidation state.

2 The common oxidation states of cerium are +3 and +4

3 Cerium (IV) acts as an oxidising agent

4 The +4 oxidation state of cerium is not known in solutions.

CHXII08:THE D- & F-BLOCK ELEMENTS

321738 Diamagnetic lanthanoid ions are

1

{La}^{3 +}

and

{Ce}^{4 +}

2

{Lu}^{3 +}

and

{Eu}^{3 +}

3

{Nd}^{3 +}

and

{Eu}^{3 +}

4

{Nd}^{3 +}

and

{Ce}^{4 +}

Explanation:

The lanthanoid ions other than the $4 f^{0} ({La}^{3 +}$ and ${Ce}^{4 +})$ and the $4 f^{14}$ type $({Yb}^{2 +}$ and ${Lu}^{3 +})$ are all paramagnetic. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321739 Which of the following statements related to lanthanoids is incorrect?

1 Lanthanoids are silvery white soft metals.

2 Samarium shows +2 oxidation state

3

{Ce}^{+ 4}

solutions are widely used as oxidising agents in titrimetric analysis.

4 Colour of Lanthanoid ion in solution is due to d-d transition .

KCET - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321740 Consider the following statements
(I) $La (OH)_{3}$ is the least basic among hydroxides of lanthanides.
(II) ${Zr}^{4 +}$ and ${Hf}^{4 +}$ possess almost the same ionic radii.
(III) $C e^{4 +}$ can act as an oxidizing agent.
Which of the above is/are true?

1 (I) and (III)

2 (II) and (III)

3 (II) only

4 (I) and (II)

Explanation:

As a result of lanthanoid contraction ${Zr}^{4 +}$ and $H f^{4 +}$ possess almost the same ionic radii. $C e^{4 +}$ is an oxidising agent. $C e^{4 +}$ gains electron to acquire more stable ${Ce}^{3 +}$ state. $La (OH)_{3}$ is the most basic among lanthanide hydroxides.

CHXII08:THE D- & F-BLOCK ELEMENTS

321741 Lanthanide for which $+ II$ and $+ III$ oxidation states are common is

1

La

2

Nd

3

Ce

4

Eu

Explanation:

Lanthanum shows +3 oxidation state.
Cerium shows $+ 3, + 4$ oxidation states
Nd shows $+ 2, + 3, + 4$ , oxidation states
Eu shows $+ 2, + 3$ oxidation states

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321742 Cerium $(Z = 58)$ is an important member of the Lanthanoids. Which of the following statements about cerium is incorrect?

1 The +3 oxidation state of cerium is more stable than the +4 oxidation state.

2 The common oxidation states of cerium are +3 and +4

3 Cerium (IV) acts as an oxidising agent

4 The +4 oxidation state of cerium is not known in solutions.

CHXII08:THE D- & F-BLOCK ELEMENTS

321738 Diamagnetic lanthanoid ions are

1

{La}^{3 +}

and

{Ce}^{4 +}

2

{Lu}^{3 +}

and

{Eu}^{3 +}

3

{Nd}^{3 +}

and

{Eu}^{3 +}

4

{Nd}^{3 +}

and

{Ce}^{4 +}

Explanation:

The lanthanoid ions other than the $4 f^{0} ({La}^{3 +}$ and ${Ce}^{4 +})$ and the $4 f^{14}$ type $({Yb}^{2 +}$ and ${Lu}^{3 +})$ are all paramagnetic. So, the correct option is (1).

JEE Main - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321739 Which of the following statements related to lanthanoids is incorrect?

1 Lanthanoids are silvery white soft metals.

2 Samarium shows +2 oxidation state

3

{Ce}^{+ 4}

solutions are widely used as oxidising agents in titrimetric analysis.

4 Colour of Lanthanoid ion in solution is due to d-d transition .

KCET - 2024

CHXII08:THE D- & F-BLOCK ELEMENTS

321740 Consider the following statements
(I) $La (OH)_{3}$ is the least basic among hydroxides of lanthanides.
(II) ${Zr}^{4 +}$ and ${Hf}^{4 +}$ possess almost the same ionic radii.
(III) $C e^{4 +}$ can act as an oxidizing agent.
Which of the above is/are true?

1 (I) and (III)

2 (II) and (III)

3 (II) only

4 (I) and (II)

Explanation:

As a result of lanthanoid contraction ${Zr}^{4 +}$ and $H f^{4 +}$ possess almost the same ionic radii. $C e^{4 +}$ is an oxidising agent. $C e^{4 +}$ gains electron to acquire more stable ${Ce}^{3 +}$ state. $La (OH)_{3}$ is the most basic among lanthanide hydroxides.

CHXII08:THE D- & F-BLOCK ELEMENTS

321741 Lanthanide for which $+ II$ and $+ III$ oxidation states are common is

1

La

2

Nd

3

Ce

4

Eu

Explanation:

Lanthanum shows +3 oxidation state.
Cerium shows $+ 3, + 4$ oxidation states
Nd shows $+ 2, + 3, + 4$ , oxidation states
Eu shows $+ 2, + 3$ oxidation states

AIIMS - 2013

CHXII08:THE D- & F-BLOCK ELEMENTS

321742 Cerium $(Z = 58)$ is an important member of the Lanthanoids. Which of the following statements about cerium is incorrect?

1 The +3 oxidation state of cerium is more stable than the +4 oxidation state.

2 The common oxidation states of cerium are +3 and +4

3 Cerium (IV) acts as an oxidising agent

4 The +4 oxidation state of cerium is not known in solutions.

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