D and F Block Elements Test

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D and F Block Elements Test - 3

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Weekly Quiz Competition

Question 1
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Generally transition metals act as catalyst because of –

A
free valencies

B
large surface area

C
unpaired d- electrons

D
all of these

Solution

Transition metals acts as a catalyst due to the free valencies; large surface area and availability of unpaired d-electron.
Question 2
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Zn and Hg belong to the same group, they differ in many of their properties. The property that is shared by both is –

A
they form oxide readily

B
they react with steam readily

C
they react with hot NaOH

D
None of these

Solution

Zn and Hg belong to same group, they different in many of their properties as the oxide readily and the react with not conc. H₂SO₄
Zn + 1/2 O₂→ ZnO
Zn + H₂SO₄→ ZnSO₄ + H₂
Question 3
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The element Z = 107 and Z = 109 have been made recently; element Z = 108 has not yet been made. Indicate the group in which you will place the above elements.

A
7, 8, 9

B
5,6,7

C
8,9,10

D
4, 5, 6

Solution

The electronic configuration of these elements are:
Z = 107 [Rn] 5f ¹⁴ 6d⁵ 7s²
Z = 108 [Rn] 5f ¹⁴ 6d⁶ 7s²
Z = 109 [Rn] 5f ¹⁴ 6d⁷ 7s²
These elements will be place in d-block in groups 7th, 8th and 9th respectively.
Question 4
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Identify the incorrect statement among the following:

A
The chemistry of various lanthanoids is very similar

B
4f and 5f orbitals are equally shielded

C
d-Block elements show irregular and erratic chemical properties among themselves

D
La and Lu have partially filled d orbitals and no other partially filled orbitals

Solution

4f and 5f belongs to different energy levels, hence the shielding effect is on them is not the same.
Shielding of 4f is more than 5f.
Hence, option B is correct.
Question 5
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The actinoides exhibit more number of oxidation states in general than the lanthanoids. This is because

A
the actinoids are more reactive than the lanthanoids

B
the 5f orbitals extend further from the nucleus than the 4f orbitals

C
the 4forbitalsare more buried than the 4f orbitals

D
there is a similarity between 4f and 5f orbitals in their angular part of the wave function

Solution

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because the 5f orbitals extend further from the nucleus than the 4f orbitals.
Hence, option B is correct.
Question 6
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Lanthanoid contraction is caused due to

A
the same effective nuclear charge from Ce to Lu

B
the imperfect shielding on outer electron by 4f electrons from the nuclear charge

C
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

D
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

Solution

4f type of orbitals aredifused and have imperfect shielding.
Question 7
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Larger number of oxidiation states are exhibited by the actinoids than those by the lanthanoids the main reason being

A
Due to more energy difference between 5f and 6d than between 4f and 5d orbitals

B
Because of more reactive nature of the actinoids than the lanthanoids

C
Because 4f orbitals more diffused than the 5f orbitals

D
Due to lesser energy difference between 5f and 6d than between 4f and 5d orbitals

Solution

This is because of comparatively lesser difference in the energies of 5f and 6d than 4f and 5d orbitals.
Question 8
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Which of the following group of transition metals is called coinage metals?

A
Cu, Ag, Au

B
Ru, Rh, Pd

C
Fe, Co, Ni

D
Os, Ir, Pt

Solution

Cu, Ag, Au group of elements are called coinage metals as these are used in minting coins.
Hence, option A is correct.

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Re-Attempt Weekly Quiz Competition

D and F Block Elements Test - 3

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D and F Block Elements Test - 3

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SHARING IS CARING

Question 1

free valencies

large surface area

unpaired d- electrons

all of these

Solution

Question 2

they form oxide readily

they react with steam readily

they react with hot NaOH

None of these

Solution

Question 3

7, 8, 9

5,6,7

8,9,10

4, 5, 6

Solution

Question 4

The chemistry of various lanthanoids is very similar

4f and 5f orbitals are equally shielded

d-Block elements show irregular and erratic chemical properties among themselves

La and Lu have partially filled d orbitals and no other partially filled orbitals

Solution

Question 5

the actinoids are more reactive than the lanthanoids

the 5f orbitals extend further from the nucleus than the 4f orbitals

the 4forbitalsare more buried than the 4f orbitals

there is a similarity between 4f and 5f orbitals in their angular part of the wave function

Solution

Question 6

the same effective nuclear charge from Ce to Lu

the imperfect shielding on outer electron by 4f electrons from the nuclear charge

the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

Solution

Question 7

Due to more energy difference between 5f and 6d than between 4f and 5d orbitals

Because of more reactive nature of the actinoids than the lanthanoids

Because 4f orbitals more diffused than the 5f orbitals

Due to lesser energy difference between 5f and 6d than between 4f and 5d orbitals

Solution

Question 8

Cu, Ag, Au

Ru, Rh, Pd

Fe, Co, Ni

Os, Ir, Pt

Solution

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