d and f-Block Elements Test

Result

d and f-Block Elements Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

The characteristic that does not contribute to catalytic activities of transition elements is

A
variable oxidation states

B
presence of free valencies on their surfaces

C
the ability to absorb and re-emit energies over a wide range

D
high ionization energies

Solution

The tendency of transition elements to exhibit variable oxidation states enables them to form intermediates with lower ionization energies.
Question 2
1 / -0

All of the following are interstitial compounds of transition elements, except

A
oxides

B
hydrides

C
borides

D
nitrides

Solution

Oxides of transition elements are ionic compounds.
Question 3
1 / -0

Which of the following statements about interstitial compounds is incorrect?

A
They are hard and rigid.

B
They do not conduct electricity.

C
The malleability and ductility of the metal decrease.

D
The tenacity of the metal increases.

Solution

The electrical conductivity of transition elements is retained in interstitial compounds.
Question 4
1 / -0

The element that does not form an amalgam is

A
Ag

B
Au

C
Fe

D
Zn

Solution

Iron does not reduce readily and hence, mercury cannot diffuse into iron lattice to form amalgam.
Question 5
1 / -0

Elements like Fe, Co and Ni acquire permanent magnetic moment when placed in a magnetic field. The property is referred to as

A
ferrimagnetism

B
anti-ferrimagnetism

C
diamagnetism

D
ferromagnetism

Solution

The domains of the unpaired electrons get aligned along the same direction to make the substance strongly magnetic.
Question 6
1 / -0

The oxidising action of KMnO₄ is strongest in the acidic medium. Which of the following acids is/are not suitable for creating the acidic medium?

A
H₂SO₄

B
HNO₃

C
Both HCl and HNO₃

D
HCl

Solution

Chloride ion undergoes oxidation to produce chlorine gas and thus, interferes with the results. HNO₃ is itself a strong oxidising agent and will also interfere with the results.
Question 7
1 / -0

The green-coloured compound formed when manganese dioxide is fused with KOH is

A
KMnO₄

B
Mn₂O₇

C
K₂MnO₄

D
Mn₃O₄

Solution

2MnO₂ + 4KOH + O₂ → 2K₂MnO₄ + 2H₂O
Question 8
1 / -0

The group of elements with abnormally low values of IE₃ is

A
La, Gd, Lu

B
Sm, Gd, Yb

C
Lu, Gd, La

D
Eu, Sm, Lu

Solution

Loss of 3 electrons enables these elements to acquire the stable electronic configuration of empty, half-filled and fully-filled 4f orbitals.
Question 9
1 / -0

Which of the following statements is incorrect?

A
Actinoids exhibit a large number of oxidation states and are generally radioactive.

B
Berkelium has half-filled 5f-orbital.

C
4f-orbital penetrates closer to the nucleus than 5f-orbital.

D
Actinoids and lanthanoids have high melting and boiling points.

Solution

Bk: [Rn] 5f⁹ 6d⁰ 7s²
Berkelium (atomic number = 97) shows an exceptional configuration of 5f-orbital, i.e. it is neither completely filled nor half-filled.

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d and f-Block Elements Test - 11

Result

d and f-Block Elements Test - 11

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Question 1

variable oxidation states

presence of free valencies on their surfaces

the ability to absorb and re-emit energies over a wide range

high ionization energies

Solution

Question 2

oxides

hydrides

borides

nitrides

Solution

Question 3

They are hard and rigid.

They do not conduct electricity.

The malleability and ductility of the metal decrease.

The tenacity of the metal increases.

Solution

Question 4

Ag

Au

Fe

Zn

Solution

Question 5

ferrimagnetism

anti-ferrimagnetism

diamagnetism

ferromagnetism

Solution

Question 6

H2SO4

HNO3

Both HCl and HNO3

HCl

Solution

Question 7

KMnO4

Mn2O7

K2MnO4

Mn3O4

Solution

Question 8

La, Gd, Lu

Sm, Gd, Yb

Lu, Gd, La

Eu, Sm, Lu

Solution

Question 9

Actinoids exhibit a large number of oxidation states and are generally radioactive.

Berkelium has half-filled 5f-orbital.

4f-orbital penetrates closer to the nucleus than 5f-orbital.

Actinoids and lanthanoids have high melting and boiling points.

Solution

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H₂SO₄

HNO₃

Both HCl and HNO₃

KMnO₄

Mn₂O₇

K₂MnO₄

Mn₃O₄