QBManager

CHXII08:THE D- & F-BLOCK ELEMENTS

321687 Read the Assertion and Reason carefully and mark correct options.
Assertion :
5 f electrons can participate in bonding to a far greater extent than 4 f electrons.
Reason :
5 f orbitals are not as buried as 4f orbitals.

1 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

2 Assertion is false but Reason is true.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321688 Which of the following is the approximate radius of Hf (in $A^{\circ}$ unit), if radius of Zr is 1.45 $A^{\circ}$ ?

1 0.45

A^{\circ}

2 1.32

A^{\circ}

3 1.44

A^{\circ}

4 2.45

A^{\circ}

Explanation:

Due to Lanthanoid contraction, 4d - series $(Zr)$ and 5d- series (Hf) will have almost same atomic radius.

CHXII08:THE D- & F-BLOCK ELEMENTS

321689 The lanthanide contraction is due to

1 perfect shielding of 4f-electrons

2 imperfect shielding of 4f -electrons

3 perfect shielding of 3d-electrons

4 imperfect shielding of 3d -electrons.

CHXII08:THE D- & F-BLOCK ELEMENTS

321690 Here, A, B, C, D, E and F refer to
supporting img

1

A - {LnO}_{3}; B - {LnS}_{3}; C - {LnC}_{2}; D - {LnX}_{3}

;

E - LnN; F - H_{2}

2

A - {LnO}_{3}; B - {LnX}_{3}; C - {LnC}_{2}; D - {LnS}_{3}

;

E - H_{2}; F - LnN

3

A - H_{2}; B - L n X_{3}; C - L n C_{2}; D - L n N; E - L n_{2} S_{3};

4

A - H_{2}; B - Ln X_{3}; C - L n_{2} C_{3}; D - LnN;

E - Ln S_{2} F - Ln O_{2}

CHXII08:THE D- & F-BLOCK ELEMENTS

321687 Read the Assertion and Reason carefully and mark correct options.
Assertion :
5 f electrons can participate in bonding to a far greater extent than 4 f electrons.
Reason :
5 f orbitals are not as buried as 4f orbitals.

1 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

2 Assertion is false but Reason is true.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321688 Which of the following is the approximate radius of Hf (in $A^{\circ}$ unit), if radius of Zr is 1.45 $A^{\circ}$ ?

1 0.45

A^{\circ}

2 1.32

A^{\circ}

3 1.44

A^{\circ}

4 2.45

A^{\circ}

Explanation:

Due to Lanthanoid contraction, 4d - series $(Zr)$ and 5d- series (Hf) will have almost same atomic radius.

CHXII08:THE D- & F-BLOCK ELEMENTS

321689 The lanthanide contraction is due to

1 perfect shielding of 4f-electrons

2 imperfect shielding of 4f -electrons

3 perfect shielding of 3d-electrons

4 imperfect shielding of 3d -electrons.

CHXII08:THE D- & F-BLOCK ELEMENTS

321690 Here, A, B, C, D, E and F refer to
supporting img

1

A - {LnO}_{3}; B - {LnS}_{3}; C - {LnC}_{2}; D - {LnX}_{3}

;

E - LnN; F - H_{2}

2

A - {LnO}_{3}; B - {LnX}_{3}; C - {LnC}_{2}; D - {LnS}_{3}

;

E - H_{2}; F - LnN

3

A - H_{2}; B - L n X_{3}; C - L n C_{2}; D - L n N; E - L n_{2} S_{3};

4

A - H_{2}; B - Ln X_{3}; C - L n_{2} C_{3}; D - LnN;

E - Ln S_{2} F - Ln O_{2}

CHXII08:THE D- & F-BLOCK ELEMENTS

321687 Read the Assertion and Reason carefully and mark correct options.
Assertion :
5 f electrons can participate in bonding to a far greater extent than 4 f electrons.
Reason :
5 f orbitals are not as buried as 4f orbitals.

1 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

2 Assertion is false but Reason is true.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321688 Which of the following is the approximate radius of Hf (in $A^{\circ}$ unit), if radius of Zr is 1.45 $A^{\circ}$ ?

1 0.45

A^{\circ}

2 1.32

A^{\circ}

3 1.44

A^{\circ}

4 2.45

A^{\circ}

Explanation:

Due to Lanthanoid contraction, 4d - series $(Zr)$ and 5d- series (Hf) will have almost same atomic radius.

CHXII08:THE D- & F-BLOCK ELEMENTS

321689 The lanthanide contraction is due to

1 perfect shielding of 4f-electrons

2 imperfect shielding of 4f -electrons

3 perfect shielding of 3d-electrons

4 imperfect shielding of 3d -electrons.

CHXII08:THE D- & F-BLOCK ELEMENTS

321690 Here, A, B, C, D, E and F refer to
supporting img

1

A - {LnO}_{3}; B - {LnS}_{3}; C - {LnC}_{2}; D - {LnX}_{3}

;

E - LnN; F - H_{2}

2

A - {LnO}_{3}; B - {LnX}_{3}; C - {LnC}_{2}; D - {LnS}_{3}

;

E - H_{2}; F - LnN

3

A - H_{2}; B - L n X_{3}; C - L n C_{2}; D - L n N; E - L n_{2} S_{3};

4

A - H_{2}; B - Ln X_{3}; C - L n_{2} C_{3}; D - LnN;

E - Ln S_{2} F - Ln O_{2}

CHXII08:THE D- & F-BLOCK ELEMENTS

321687 Read the Assertion and Reason carefully and mark correct options.
Assertion :
5 f electrons can participate in bonding to a far greater extent than 4 f electrons.
Reason :
5 f orbitals are not as buried as 4f orbitals.

1 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

2 Assertion is false but Reason is true.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321688 Which of the following is the approximate radius of Hf (in $A^{\circ}$ unit), if radius of Zr is 1.45 $A^{\circ}$ ?

1 0.45

A^{\circ}

2 1.32

A^{\circ}

3 1.44

A^{\circ}

4 2.45

A^{\circ}

Explanation:

Due to Lanthanoid contraction, 4d - series $(Zr)$ and 5d- series (Hf) will have almost same atomic radius.

CHXII08:THE D- & F-BLOCK ELEMENTS

321689 The lanthanide contraction is due to

1 perfect shielding of 4f-electrons

2 imperfect shielding of 4f -electrons

3 perfect shielding of 3d-electrons

4 imperfect shielding of 3d -electrons.

CHXII08:THE D- & F-BLOCK ELEMENTS

321690 Here, A, B, C, D, E and F refer to
supporting img

1

A - {LnO}_{3}; B - {LnS}_{3}; C - {LnC}_{2}; D - {LnX}_{3}

;

E - LnN; F - H_{2}

2

A - {LnO}_{3}; B - {LnX}_{3}; C - {LnC}_{2}; D - {LnS}_{3}

;

E - H_{2}; F - LnN

3

A - H_{2}; B - L n X_{3}; C - L n C_{2}; D - L n N; E - L n_{2} S_{3};

4

A - H_{2}; B - Ln X_{3}; C - L n_{2} C_{3}; D - LnN;

E - Ln S_{2} F - Ln O_{2}