NEET f-Block Elements- Properties & Uses Practice Questions With Solutions

NEET Chemistry f-Block Elements- Properties & Uses Practice Questions

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Question 1.

The behaviour of samarium (Z=62) is very much like europium (Z=63), since both elements:

Aexhibit +2 and +3 oxidation states.

Bhave \(4 f^5 6 s^2 \) and \(4 f^6 6 s^2\) electronic configurations, respectively.

Chave \(4 f^7 6 s^2\) and \(4 f^8 6 s^2\) electronic configurations, respectively.

Dhave the same atomic radii.

Question 2.

The pair of lanthanoid ions, consisting of elements which are diamagnetic, is:

ACe³⁺ and Eu²⁺

BGd³⁺and Eu³⁺

CPm³⁺and Sm³⁺

DCe⁴⁺and Yb²⁺

Question 3.

The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are:

ABroad and f orbitals

BNarrow and f orbitals

CBroad and d and f orbitals

DNarrow and d and f orbitals

Question 4.

Gadolinium has a low value of third ionisation enthalpy because of:

AHigh basic character

BSmall size

CHigh exchange enthalpy

DHigh electronegativity

Question 5.

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

A[Xe] 4f⁶5d¹6s², [Xe]4f⁷5d¹6s², and [Xe] 4f⁹6s²

B[Xe] 4f⁶5d¹6s², [Xe] 4f⁷5d¹ 6s², and [Xe]4f⁸5d¹6s²

C[Xe] 4f⁷6s², [Xe]4f⁷5d¹6s², and [Xe] 4f⁹ 6s²

D[Xe] 4f⁷6s², (Xe]4f⁸6s², and [Xe]4f⁸ 5d¹6s²

Question 6.

Identify the incorrect statements related to lanthanons:

AEuropium shows +2 oxidation state.

BThe basicity decreases as the ionic radius decreases from Pr to Lu.

CAll the lanthanons are much more reactive than aluminium.

DCe⁺⁴ solutions are widely used as oxidizing agents in volumetric analysis.

Question 7.

Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

[X e] 4 f^{8} 6 d^{2}

[X e] 4 f^{9} 5 s^{1}

[X e] 4 f^{7} 5 d^{1} 6 s^{2}

[X e] 4 f^{6} 5 d^{2} 6 s^{2}

Question 8.

Diamagnetic lanthanoid ion among the following is: (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

ASm²⁺

BEu²⁺

CYb²⁺

DCe²⁺

Question 9.

Lanthanoid's most common oxidation state is:

Question 10.

Actinoids exhibit more oxidation states than lanthanoids. The main reason for this is:

AMore energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

BGreater metallic character of the lanthanoids than that of the corresponding actinoids

CThe lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

DMore active nature of the actinoids

Question 1.

The general electronic configuration of lanthanoids is:

A(n – 2) f ^1–14 (n – 1) s² p⁶ d^0–1 ns²

B(n – 2) f ^10–14 (n – 1) d^0–1 ns²

C(n – 2) f ^0–14(n – 1) d¹⁰ ns²

D(n – 2) d^0–1 (n – 1) f ^1–14 ns²

Question 2.

An incorrect statement among the following is :

ALa(OH)₃ is less basic than Lu(OH)₃

BIn Lanthanide series, ionic radius of Ln⁺³ions decreases.

CLa is an element of a transition and not of Lanthanide series.

DThe atomic radius of Zr and Hf are the same because of Lanthanide contraction.

Question 3.

Maximum oxidation state is shown by:

ALa

BGd

CEu

DAm

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NEET f-Block Elements- Properties & Uses Practice Questions With Solutions

NEET Chemistry f-Block Elements- Properties & Uses Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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