The lanthanoids
« Previous Topic: The actionoids Last Topic in »
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 \( \mathop {\rm{A}}^{\circ} \) unit), if radius of Zr is 1.45 \( \mathop {\rm{A}}^{\circ} \) ?

1 0.45 \( \mathop {\rm{A}}^{\circ} \)
2 1.32 \( \mathop {\rm{A}}^{\circ} \)
3 1.44 \( \mathop {\rm{A}}^{\circ} \)
4 2.45 \( \mathop {\rm{A}}^{\circ} \)
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 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnS}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnX}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{LnN} ; \mathrm{F}-\mathrm{H}_{2}}\)
2 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnX}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnS}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{H}_{2} ; \mathrm{F}-\mathrm{LnN}}\)
3 \({\rm{A - }}{{\rm{H}}_{\rm{2}}}{\rm{;B - Ln}}{{\rm{X}}_{\rm{3}}}{\rm{;C - Ln}}{{\rm{C}}_{\rm{2}}}{\rm{;D - LnN;E - L}}{{\rm{n}}_{\rm{2}}}{{\rm{S}}_{\rm{3}}}{\rm{;}}\)
4 \({\text{A - }}{{\text{H}}_{\text{2}}};{\text{B - Ln}}{{\text{X}}_{\text{3}}};{\text{C - L}}{{\text{n}}_{\text{2}}}{{\text{C}}_{\text{3}}};{\text{D - LnN}};\)
\({\text{E - Ln}}{{\text{S}}_{\text{2}}}{\text{F - Ln}}{{\text{O}}_{\text{2}}}\)
NEET DIGITAL LIBRARY
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 \( \mathop {\rm{A}}^{\circ} \) unit), if radius of Zr is 1.45 \( \mathop {\rm{A}}^{\circ} \) ?

1 0.45 \( \mathop {\rm{A}}^{\circ} \)
2 1.32 \( \mathop {\rm{A}}^{\circ} \)
3 1.44 \( \mathop {\rm{A}}^{\circ} \)
4 2.45 \( \mathop {\rm{A}}^{\circ} \)
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 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnS}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnX}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{LnN} ; \mathrm{F}-\mathrm{H}_{2}}\)
2 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnX}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnS}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{H}_{2} ; \mathrm{F}-\mathrm{LnN}}\)
3 \({\rm{A - }}{{\rm{H}}_{\rm{2}}}{\rm{;B - Ln}}{{\rm{X}}_{\rm{3}}}{\rm{;C - Ln}}{{\rm{C}}_{\rm{2}}}{\rm{;D - LnN;E - L}}{{\rm{n}}_{\rm{2}}}{{\rm{S}}_{\rm{3}}}{\rm{;}}\)
4 \({\text{A - }}{{\text{H}}_{\text{2}}};{\text{B - Ln}}{{\text{X}}_{\text{3}}};{\text{C - L}}{{\text{n}}_{\text{2}}}{{\text{C}}_{\text{3}}};{\text{D - LnN}};\)
\({\text{E - Ln}}{{\text{S}}_{\text{2}}}{\text{F - Ln}}{{\text{O}}_{\text{2}}}\)
Join With Us for More Updates
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 \( \mathop {\rm{A}}^{\circ} \) unit), if radius of Zr is 1.45 \( \mathop {\rm{A}}^{\circ} \) ?

1 0.45 \( \mathop {\rm{A}}^{\circ} \)
2 1.32 \( \mathop {\rm{A}}^{\circ} \)
3 1.44 \( \mathop {\rm{A}}^{\circ} \)
4 2.45 \( \mathop {\rm{A}}^{\circ} \)
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 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnS}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnX}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{LnN} ; \mathrm{F}-\mathrm{H}_{2}}\)
2 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnX}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnS}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{H}_{2} ; \mathrm{F}-\mathrm{LnN}}\)
3 \({\rm{A - }}{{\rm{H}}_{\rm{2}}}{\rm{;B - Ln}}{{\rm{X}}_{\rm{3}}}{\rm{;C - Ln}}{{\rm{C}}_{\rm{2}}}{\rm{;D - LnN;E - L}}{{\rm{n}}_{\rm{2}}}{{\rm{S}}_{\rm{3}}}{\rm{;}}\)
4 \({\text{A - }}{{\text{H}}_{\text{2}}};{\text{B - Ln}}{{\text{X}}_{\text{3}}};{\text{C - L}}{{\text{n}}_{\text{2}}}{{\text{C}}_{\text{3}}};{\text{D - LnN}};\)
\({\text{E - Ln}}{{\text{S}}_{\text{2}}}{\text{F - Ln}}{{\text{O}}_{\text{2}}}\)
For More Updates join with Us
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 \( \mathop {\rm{A}}^{\circ} \) unit), if radius of Zr is 1.45 \( \mathop {\rm{A}}^{\circ} \) ?

1 0.45 \( \mathop {\rm{A}}^{\circ} \)
2 1.32 \( \mathop {\rm{A}}^{\circ} \)
3 1.44 \( \mathop {\rm{A}}^{\circ} \)
4 2.45 \( \mathop {\rm{A}}^{\circ} \)
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 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnS}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnX}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{LnN} ; \mathrm{F}-\mathrm{H}_{2}}\)
2 \(\mathrm{\mathrm{A}-\mathrm{LnO}_{3} ; \mathrm{B}-\mathrm{LnX}_{3} ; \mathrm{C}-\mathrm{LnC}_{2} ;
\mathrm{D}-\mathrm{LnS}_{3}}\); \(\mathrm{\mathrm{E}-\mathrm{H}_{2} ; \mathrm{F}-\mathrm{LnN}}\)
3 \({\rm{A - }}{{\rm{H}}_{\rm{2}}}{\rm{;B - Ln}}{{\rm{X}}_{\rm{3}}}{\rm{;C - Ln}}{{\rm{C}}_{\rm{2}}}{\rm{;D - LnN;E - L}}{{\rm{n}}_{\rm{2}}}{{\rm{S}}_{\rm{3}}}{\rm{;}}\)
4 \({\text{A - }}{{\text{H}}_{\text{2}}};{\text{B - Ln}}{{\text{X}}_{\text{3}}};{\text{C - L}}{{\text{n}}_{\text{2}}}{{\text{C}}_{\text{3}}};{\text{D - LnN}};\)
\({\text{E - Ln}}{{\text{S}}_{\text{2}}}{\text{F - Ln}}{{\text{O}}_{\text{2}}}\)
NEET DIGITAL LIBRARY