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NEET Exam  >  NEET Tests  >  Topic-wise MCQ Tests for NEET  >  Test: f-Block Elements (Lanthanides) - I - NEET MCQ

Test: f-Block Elements (Lanthanides) - I - NEET MCQ


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25 Questions MCQ Test Topic-wise MCQ Tests for NEET - Test: f-Block Elements (Lanthanides) - I

Test: f-Block Elements (Lanthanides) - I for NEET 2024 is part of Topic-wise MCQ Tests for NEET preparation. The Test: f-Block Elements (Lanthanides) - I questions and answers have been prepared according to the NEET exam syllabus.The Test: f-Block Elements (Lanthanides) - I MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: f-Block Elements (Lanthanides) - I below.
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Test: f-Block Elements (Lanthanides) - I - Question 1
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Only One Option Correct Type

Direction (Q. Nos. 1- 10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q. 

Set of continuous atomic numbers of elements are present in the same group as well as same period.

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 1

Er (68), Tm (69), Yb (70) and Lu (71) elements are present in same group as well as same period.

Test: f-Block Elements (Lanthanides) - I - Question 2
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The element with atomic number 62 belongs

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 2

Samarium (Sm) (Z = 62) belongs to III B group and 6th period.

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Test: f-Block Elements (Lanthanides) - I - Question 3
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The radius of lanthanum is 1.06 Å. Then which of the following is closest to the radius of Lu3+ ion

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 3

Due to lanthanoid contraction.

Test: f-Block Elements (Lanthanides) - I - Question 4
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+ 4 ion of which has half-filled 4f subshell
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 4

Tb (Z = 65) have [Xe] 4f95d06s2 configuration. Tb4+ have half-filled 4f subshell, i.e. 4f7.

Test: f-Block Elements (Lanthanides) - I - Question 5
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Lanthanide for which + II and + III oxidation states are common is
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 5

Europium (Eu) has [Xe] 4f75d06s2 configuration. The oxidation state of + 2 and + 3 are exhibited by these elements, e.g. Eu2+ is[Xe] 4f7and Eu3+ is [Xe]4f6.

Test: f-Block Elements (Lanthanides) - I - Question 6
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An alloy of lanthanide
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 6

Misch metal is lanthanide metal (95%) and iron (5%) and traces of S, C, Ca, Al.

Test: f-Block Elements (Lanthanides) - I - Question 7
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Across the lanthanide series, the basicity of the lanthanide hydroxides
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 7

The basicity decreases from Ce(OH)3 to Lu(OH)3. Due to lanthanide contraction, the decrease in the size of the cation increases the covalent character between the lanthanide ion and hydroxide ion thereby, reducing the basic character of the lanthanide hydroxide.

Test: f-Block Elements (Lanthanides) - I - Question 8
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Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 8

Gadolinium (Gd) have [Xe] 4f75d16s2 configuration.

Test: f-Block Elements (Lanthanides) - I - Question 9
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Lanthanides contraction causes
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 9

Electronegativity increases as we move from left to right due to lanthanide contraction.

Test: f-Block Elements (Lanthanides) - I - Question 10
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Which one of the following statement(s) is/are incorrect for lanthanides?
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 10

The hardness increases with increasing atomic number.

*Multiple options can be correct
Test: f-Block Elements (Lanthanides) - I - Question 11
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One or More than One Options Correct Type

Direction (Q. Nos. 11-15) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q.

Which of the following statements are incorrect regarding lanthanides?
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 11

Ce3+ (4f1) and Yb3+ (f13) are colourless because they do not absorb in the visible region. The E° value for Ce4+ /Ce3+ is + 1.74 V which suggest it is strong oxidising agent.

Test: f-Block Elements (Lanthanides) - I - Question 12
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Observe the following statements. Which is correct statement regarding lanthanides?
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 12

The correct answer is option B
Ce shows +4 oxidation state in aq.solution
Ce (58) to lu (71)-  lanthanide
Th (90) to Lr (103)- actinoids.

*Multiple options can be correct
Test: f-Block Elements (Lanthanides) - I - Question 13
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The colourless ions among the lanthanides are
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 13

La3+, Gd3+ and Lu3+ have empty (4f0) half-filled (4f7) and full-filled (4f14) orbitals. Ce3+ (4f1) is colourless because it does not absorb in the visible region.

*Multiple options can be correct
Test: f-Block Elements (Lanthanides) - I - Question 14
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The correct statements among the following are
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 14

Basic strength decreases from La(OH)3 to Lu (OH)3,

*Multiple options can be correct
Test: f-Block Elements (Lanthanides) - I - Question 15
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Which of the following pairs have same atomic size?
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 15

The pair of elements Zr - Hf, Nb - Ta, Mo - W possess almost the same size. After the lanthanoids the increase in radii from second to third transition series almost vanishes.

Test: f-Block Elements (Lanthanides) - I - Question 16
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Comprehension Type

Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

The observed oxidation state of lanthanides either in solution or in insoluble compounds form tripositive cations. Based on the ionisation enthalpies and hydration energy factors, it is concluded that tripositive species is more stable than di or tetrapositive species in aqueous solution. In general, ions having half-filled (Tb4+ , Eu2+ , Gd3+) or completely filled 4f orbitals (Yb2+, Lu3+) or noble gas configuration (La3+, Ce4+) are stable. This is supported by their SRP values. Ions with + 4 oxidation state act as oxidising and ions having + 2 oxidation state act as reducing agents. Ions having same number of unpaired electrons in f-orbitals possess same colour.

Q. 

Observe the following equations.
Sm3+(aq) + e- → Sm2+ (aq), E° = - 1.55 V
Eu3+(aq) + e- → Eu2+ (aq), E° = - 0.43 V
Yb3+(aq) + e- → Yb2+ (aq), E° = - 1.55V

Based on the above equations, the correct reducing strength is in the order of
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 16

More negative the SRP value, stronger is the reducing agent.

Test: f-Block Elements (Lanthanides) - I - Question 17
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The observed oxidation state of lanthanides either in solution or in insoluble compounds form tripositive cations. Based on the ionisation enthalpies and hydration energy factors, it is concluded that tripositive species is more stable than di or tetrapositive species in aqueous solution. In general, ions having half-filled (Tb4+ , Eu2+ , Gd3+) or completely filled 4f orbitals (Yb2+, Lu3+) or noble gas configuration (La3+, Ce4+) are stable. This is supported by their SRP values. Ions with + 4 oxidation state act as oxidising and ions having + 2 oxidation state act as reducing agents. Ions having same number of unpaired electrons in f-orbitals possess same colour.

Q. Which is correct statement?
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 17

Ce4+ is [Xe] 4f0, it tends to revert to more stable oxidation state of +3 by gain of an electron. That is why, in aqueous solution, Ce4+ is good oxidising agent.

Test: f-Block Elements (Lanthanides) - I - Question 18
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Matching List Type

Direction (Q. No. 18) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q. 

Match the Column I with Column II and mark the correct option from the codes given below.
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 18

(i) → (p.t) (ii) → (r) (iii) → (q,s) (iv) → (q,s)

*Answer can only contain numeric values
Test: f-Block Elements (Lanthanides) - I - Question 19
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One Integer Value Correct Type

Direction (Q. Nos. 19-23) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

Number of species that have half-filled 4f subshell among Gd, Lu, Eu, Yb, Eu2+ Gd3+ ,Eu3+ ,Ce4+ ,Tb4+.

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 19

Gd: [Xe] 4f75d16s2,
Lu: [Xe] 4f145d16s2,
Eu: [Xe] 4f75d06s2,
Yb: [Xe] 4f145d06s2,
Eu2+ : [Xe] 4f75d06s0,
Gd3+ : [Xe] 4f75d06s0,
Eu3+ : [Xe] 4f65d06s0,
Tb4+: [Xe] 4f75d06s0,
Ce4+: [Xe] 4f05d06s0,

*Answer can only contain numeric values
Test: f-Block Elements (Lanthanides) - I - Question 20
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Number of unpaired electrons in ytterbium is/are

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 20

Ytterbium has configuration [Xe] 4f145d06s2

*Answer can only contain numeric values
Test: f-Block Elements (Lanthanides) - I - Question 21
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Number of diamagnetic lanthanide ions among

La3+, Ce3+ Ce4+, Gd3+,Yb2+,Yb3+,Lu2+, Lu3+ are

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 21

La3+, Ce4+, Yb2+ and Lu3+ are diamagnetic in nature.

*Answer can only contain numeric values
Test: f-Block Elements (Lanthanides) - I - Question 22
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Number of good reducing agents among

Ce4+, Eu2+, Sm2+,Yb2+,Tb4+,La3+ Ce3+ are

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 22

Eu2+ ,Sm2+ ,Yb2+ are reducing agents.

*Answer can only contain numeric values
Test: f-Block Elements (Lanthanides) - I - Question 23
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The highest oxidation state shown by any transition element is

Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 23

The highest oxidation state shown by the transition element is Ru (+8) in 4d series and Os in 5d series.

Test: f-Block Elements (Lanthanides) - I - Question 24
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Statement Type

Direction (Q. Nos. 24 and 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Q. 

Statement I : The second and third rows of transition elements resemble each other much more than they resemble the first row.

Statement II : Due to lanthanide contraction, the atomic radii of the second and the third row transition elements.
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 24

Both statements I and II are correct. Statement II correctly explains the statement I.

Test: f-Block Elements (Lanthanides) - I - Question 25
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Statement I : Many trivalent lanthanide ions are coloured both in solid state and in aqueous solution.

Statement II : Colour of these ions is due to the presence of f-electrons.
Detailed Solution for Test: f-Block Elements (Lanthanides) - I - Question 25

Many trivalent lanthanide ions are coloured due to the presence of f-electrons, in solid state as well as in aqueous solutions.

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