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Which of the following oxidation state is common for all lanthanoids?

1.	+2	2.	+3
3.	+4	4.	+5

Subtopic: f-Block Elements- Properties & Uses |

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Q2:

Match the statement given in Column I with the corresponding element given in Column II and mark the appropriate choice.

	Column I		Column II
(A)	An element that can show +8 oxidation state	(i)	Ce
(B)	An element with +7 as the most stable oxidation state in its oxides	(ii)	Pm
(C)	Radioactive lanthanoid	(iii)	Os
(D)	Lanthanoid which shows +4 oxidation state	(iv)	Mn

1. (A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)
2. (A) → (ii), (B) → (iii), (C) → (iv), (D) → (i)
3. (A) → (iv), (B) → (i), (C) → (ii), (D) → (iii)
4. (A) → (iii), (B) → (iv), (C) → (ii), (D) → (i)

Subtopic: f-Block Elements- Properties & Uses |

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Q3:

Because of lanthanoid contraction, which of the following pairs of elements have nearly

same atomic radii? (Numbers in the parenthesis are atomic numbers).

1. Ti (22) and Zr (40)

2. Zr (40) and Nb (41)

3. Zr (40) and Hf (72)

4. Zr (40) and Ta (73)

Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |

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NEET - 2015

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Q4:

Match Column-I (alloy) with Column-II (composition) and mark the appropriate choice:

	Column-I		Column-II
(A)	Mischmetal	(i)	Alloy of Cu and Sn
(B)	Ziegler-Natta catalyst	(ii)	Alloy of lanthanoid metals
(C)	Brass	(iii)	\(\mathrm{TiCl}_4+\mathrm{Al}\left(\mathrm{CH}_3\right)_3\)
(D)	Bronze	(iv)	An alloy of Cu and Zn

1. (A)→(iv),(B)→(i),(C)→(iii),(D)→(ii)
2. (A)→(ii),(B)→(iii),(C)→(iv),(D)→(i)
3. (A)→(iii),(B)→(ii),(C)→(i),(D)→(iv)
4. (A)→(i),(B)→(iii),(C)→(ii),(D)→(iv)

Subtopic: f-Block Elements- Properties & Uses |

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Q5:

Which of the following f-block elements is most stable in the bivalent oxidation state?
1. Sm
2. Eu
3. Tb
4. Ce

Subtopic: f-Block Elements- Properties & Uses |

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Q6:

Consider the following statements

I:	La(OH)₃ is least basic among hydroxides of lanthanides.
II:	Zr⁴⁺ and Hf⁴⁺ possess almost the same ionic radii.
III:	Ce⁴⁺ can act as an oxidising agent.

True statements among the following is /are:
1. I and III
2. II and III
3. II only
4. I and II

Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |

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Q7:

The correct electronic configuration and spin only magnetic moment (BM) of Gd³⁺ (Z = 64), respectively, are:

1. [Xe]5f⁷ and 8.9
2. [Xe]4f⁷ and 7.9
3. [Xe]5f⁷ and 7.9
4. [Xe]4f⁷ and 8.9

Subtopic: f-Block Elements- Properties & Uses |

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Q8:

The well known element of lanthanoid series that exhibit +4 oxidation state, is:

1. Ac
2. Ce
3. Eu
4. Yb

Subtopic: f-Block Elements- Properties & Uses |

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Q9:

Strong reducing and oxidizing agents among the following options, respectively, are:

1.	Ce⁺³ & Ce⁺⁴	2.	Eu⁺² & Ce⁺⁴
3.	Ce²⁺ & Tb⁺²	4.	Eu⁺⁴ & Eu⁺²

Subtopic: f-Block Elements- Properties & Uses |

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Q10:

Actinoids exhibit more number of oxidation states than lanthanoids. It is because of:

1.	The greater metallic character of the lanthanoids than that of the corresponding actinoids.
2.	More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
3.	The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals.
4.	More active nature of the actinoids.

Subtopic: d-Block Elements- Properties & Uses | f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |

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AIPMT - 2011

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