The reason for the lanthanoid contraction is:

1. negligible screening effect of 'f' orbitals.

2. increasing nuclear charge.

3. decreasing nuclear charge.

4. decreasing screening effect.

Subtopic: Lanthanoid & Actinoids Contraction |

76%

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AIPMT - 2014

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Q16:

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are, respectively:

1.	[Xe] 4f⁶5d¹6s², [Xe]4f⁷5d¹6s², and [Xe] 4f⁹6s²
2.	[Xe] 4f⁶5d¹6s², [Xe] 4f⁷5d¹ 6s², and [Xe]4f⁸5d¹6s²
3.	[Xe] 4f⁷6s², [Xe]4f⁷5d¹6s², and [Xe] 4f⁹ 6s²
4.	[Xe] 4f⁷6s², (Xe]4f⁸6s², and [Xe]4f⁸ 5d¹6s²

Subtopic: f-Block Elements- Properties & Uses |

67%

From NCERT

NEET - 2016

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Q63:

Which compound cannot decolourise KMnO₄ solution?

1. CO₃^-2

2. NO₂^-

3. S^2-

4. Cl^-

Subtopic: Chemistry of Mn and Cr Compounds |

54%

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Q62:

The native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of :

1. Nitrogen

2. Oxygen

3. Carbon dioxide

4. Argon

Subtopic: d-Block Elements- Properties & Uses |

52%

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Q61:

The incorrect statement among the following regarding Cerium is :

1.	The +4 oxidation state of cerium is not known in solutions.
2.	The +3 oxidation state of cerium is more stable than the +4 oxidation state.
3.	The common oxidation states of cerium are +3, and +4.
4.	Cerium (IV) acts as an oxidizing agent.

Subtopic: Lanthanoid & Actinoids Contraction |

64%

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Q60:

The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are:

1.	Higher	2.	Equal
3.	Lower	4.	Can't compare.

Subtopic: d-Block Elements- Properties & Uses |

68%

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Q59:

Which of the following elements has the strongest metallic bond?

1.	Fe	2.	Sc
3.	V	4.	Cr

Subtopic: d-Block Elements- Properties & Uses |

56%

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Q58:

The incorrect statement among the following about the chemistry of 3d and 4f series elements is

1.	3d elements show more oxidation states than 4f series elements.
2.	The energy difference between 3d and 4s orbitals is very little.
3.	Europium (ll) is more stable than Ce (ll).
4.	The paramagnetic character of the 3d series elements increases from scandium to copper.

Subtopic: d-Block Elements- Properties & Uses |

62%

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Q57:

Which of the following metals does not form amalgam?

1. Fe

2. Au

3. Zn

4. Ag

Subtopic: d-Block Elements- Properties & Uses |

61%

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Q56:

Which of the following statements is false?

1.	MnO₂ dissolves in conc. HCl, but does not form Mn⁴⁺ions.
2.	${MnO}_{2}$ oxidizes hot concentrated $H_{2} {SO}_{4}$ liberating oxygen.
3.	$K_{2} {MnO}_{4}$ is formed when ${MnO}_{2}$ infused KOH is oxidized by air, ${KNO}_{3}$ , ${PbO}_{2}$ or ${NaBiO}_{3}$
4.	The decomposition of acidic ${KMnO}_{4}$ is not catalyzed by sunlight.

Subtopic: d-Block Elements- Properties & Uses |

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The reason for the lanthanoid contraction is:

1. negligible screening effect of 'f' orbitals.

2. increasing nuclear charge.

3. decreasing nuclear charge.

4. decreasing screening effect.

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The reason for the lanthanoid contraction is: 1. negligible screening effect of 'f' orbitals. 2. increasing nuclear charge. 3. decreasing nuclear charge. 4. decreasing screening effect.

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The reason for the lanthanoid contraction is:

1. negligible screening effect of 'f' orbitals.

2. increasing nuclear charge.

3. decreasing nuclear charge.

4. decreasing screening effect.