d and f Block Test

Question 1
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One or More than One Options Correct Type

Direction (Q. Nos. 1-5) 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?

A
All ions having unpaired electrons are coloured

B
The first and second ionisation energies are comparable with calcium

C
Ce⁴⁺ is a strong reducing agent

D
Option A,C are Correct

Question 2
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Observe the following statements. Which is correct statement regarding lanthanides?

A
Cerium shows + 4 and + 3 oxidation states

B
Element with atomic numbers 66 and 99 belong to f-block

C
Lanthanides belong to 3rd group and 7th period

D
Monazite is the mineral that constitutes the major source of the lanthanides

Question 3
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The colourless ions among the lanthanides are

A
La³⁺

B
Gd³⁺

C
Lu³⁺

D
All are correct

Question 4
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The correct statements among the following are

A
Reducing power decreases from La to Lu

B
La to Lu E °values become less negative

C
Promethium is artificial radioactive element

D
All are correct

Question 5
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Which of the following pairs have same atomic size?

A
Zr and Hf

B
Nb and Ta

C
Mo and W

D
All are correct

Question 6
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Comprehension Type

Direction : 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

A
Sm²⁺ >Yb²⁺ >Eu²⁺

B
Eu²⁺ >Yb²⁺ >Sm²⁺

C
Eu²⁺ >Sm²⁺ >Yb²⁺

D
Sm²⁺ >Eu²⁺ >Yb²⁺

Question 7
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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?

A
Ce⁴⁺ is more stable than Ce³⁺ in solution

B
Ce³⁺ is more sable than Ce⁴⁺ in solution

C
Ce⁴⁺ and Ce³⁺ are equally stable

D
Ce⁴⁺ has xenon configuration

Question 8
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Matching List Type

Direction : 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.

A
a

B
b

C
c

D
d

Question 9
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One Integer Value Correct Type

Direction : 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⁺ .

A
5

B
4

C
3

D
2

Question 10
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Number of unpaired electrons in ytterbium is/are

A
1

B
2

C
5

D
0

Question 11
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Number of diamagnetic lanthanide ions among

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

A
4

B
3

C
2

D
1

Question 12
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Number of good reducing agents among

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

A
1

B
2

C
3

D
4

Question 13
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The highest oxidation state shown by any transition element is

A
5

B
8

C
3

D
0

Question 14
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Statement Type

Direction : 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.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Question 15
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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.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Submit Test

d and f Block T...

Question 1

All ions having unpaired electrons are coloured

The first and second ionisation energies are comparable with calcium

Ce4+ is a strong reducing agent

Option A,C are Correct

Question 2

Cerium shows + 4 and + 3 oxidation states

Element with atomic numbers 66 and 99 belong to f-block

Lanthanides belong to 3rd group and 7th period

Monazite is the mineral that constitutes the major source of the lanthanides

Question 3

La3+

Gd3+

Lu3+

All are correct

Question 4

Reducing power decreases from La to Lu

La to Lu E °values become less negative

Promethium is artificial radioactive element

All are correct

Question 5

Zr and Hf

Nb and Ta

Mo and W

All are correct

Question 6

Sm2+ >Yb2+ >Eu2+

Eu2+ >Yb2+ >Sm2+

Eu2+ >Sm2+ >Yb2+

Sm2+ >Eu2+ >Yb2+

Question 7

Ce4+ is more stable than Ce3+ in solution

Ce3+ is more sable than Ce4+ in solution

Ce4+ and Ce3+ are equally stable

Ce4+ has xenon configuration

Question 8

a

b

c

d

Question 9

5

4

3

2

Question 10

1

2

5

0

Question 11

4

3

2

1

Question 12

1

2

3

4

Question 13

5

8

3

0

Question 14

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

Statement I is correct but Statement II is incorrect

Statement II is correct but Statement I is incorrect

Question 15

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

Statement I is correct but Statement II is incorrect

Statement II is correct but Statement I is incorrect

User

Question Analysis

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Ce⁴⁺ is a strong reducing agent

La³⁺

Gd³⁺

Lu³⁺

Sm²⁺ >Yb²⁺ >Eu²⁺

Eu²⁺ >Yb²⁺ >Sm²⁺

Eu²⁺ >Sm²⁺ >Yb²⁺

Sm²⁺ >Eu²⁺ >Yb²⁺

Ce⁴⁺ is more stable than Ce³⁺ in solution

Ce³⁺ is more sable than Ce⁴⁺ in solution

Ce⁴⁺ and Ce³⁺ are equally stable

Ce⁴⁺ has xenon configuration