d-Block and f-Block Elements Test

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d-Block and f-Block Elements Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The relative composition of lanthanides in mischmetal is

A
50% Ce and 25% La

B
40% La and 50% Ce

C
50% La and 50% Ce

D
40% La and 40% Ce
Question 2
1 / -0

Transition metals with lowest melting point is

A
Cr

B
Cd

C
Zn

D
Hg

Solution

Hg has lowest melting point because it doesnot have any unpaired electrons and also it belongs to 5d series (5d¹⁰6s²).
Question 3
1 / -0

Which of the following pairs has comparable values of atomic radii as well as ionization energies?

A
Sc, Ti

B
Cu, Zn

C
Cr, Mn

D
Zr, Hf
Question 4
1 / -0

Which among the following transition metal has lowest melting point?

A
Titanium

B
Scandium

C
Cobalt

D
Zinc

Solution

n has lowest melting point because it does not have any unpaired electrons (3d¹⁰ 4s²) which are necessary to form an interatomic metallic bonding.
Question 5
1 / -0

A metal halide, on reaction with potassium dichromate in the presence of conc. H₂SO₄, gives red vapours of a gas. The halide ion and the gas evolved respectively are

A
Br^- and Br₂

B
Cl^- and CrO₂Cl₂

C
I^- and CrO₂Cl₂

D
F^- and Cl₂
Question 6
1 / -0

Which among the following is not considered as a part of transition elements?

A
Zinc

B
Cadmium

C
Zirconium

D
Silver

Solution

The electronic configurations of Zn, Cd and Hg are represented by the general formula (n-1)d¹⁰ns². The orbitals in these elements are completely filled in the ground state as well as in their common oxidation states. Therefore, they are not regarded as transition elements.
Question 7
1 / -0

Which of the following give the highest possible oxidation state of a transition element?

A
ns + (n - 1)d electrons

B
ns + np electrons

C
ns + (n + 1)d electrons

D
ns + np + (n + 1)d electrons
Question 8
1 / -0

Though Zn (125 pm) has a higher atomic radius than Cu (117 pm), yet it has a higher value of first ionization energy because

A
Cu has only one electron in the 4s orbital

B
Zn has a stable configuration and a greater effective nuclear charge

C
paramagnetic species are ionized less readily

D
electrons in Zn atom face greater repulsions
Question 9
1 / -0

Which two lanthanoids are added as light filters to glass filter goggles?

A
Sm and Pr

B
Nd and La

C
Eu and Pr

D
Pr and Nd
Question 10
1 / -0

Transition elements form coordination complexes because of

A
presence of empty orbitals in the valence shell

B
high charge density

C
Both (1) and (2)

D
None of these
Question 11
1 / -0

Which of the following oxides is amphoteric?

A
Mn₂O₇

B
CrO₅

C
MnO₂

D
Cr₂O₃
Question 12
1 / -0

Transition elements can form alloys with other elements due to

A
their paramagnetic nature

B
their high melting points

C
comparable sizes of their atoms

D
their electrical conductivities
Question 13
1 / -0

Which of the following statements is true about nickel and titanium ions in their +2 oxidation states?

A
Both are diamagnetic.

B
Both have the same magnetic moment.

C
Both have the same electronic configuration.

D
Both have the same number of 3d electrons.
Question 14
1 / -0

The number of water of crystallization in hydrated copper sulphate is

A
5

B
4

C
2

D
1
Question 15
1 / -0

Which of the following is not a property of transition elements?

A
High value of ionization enthalpy

B
Paramagnetism

C
High heat of hydration

D
High heat of sublimation
Question 16
1 / -0

Mercurous ion is

A
diamagnetic

B
paramagnetic

C
ferromagnetic

D
ferrimagnetic
Question 17
1 / -0

The chromium atoms in both Cr₂O₇^2-and CrO₄^2- are sp³ hybridised. All the Cr-O bonds are equivalent in

A
Cr₂O₇^2-

B
both Cr₂O₇^2- and CrO₄^2-

C
CrO₄^2-

D
None of these
Question 18
1 / -0

K₂Cr₂O₇ reacts with NH₄Cl in the presence of H₂SO₄. The product formed is

A
chromyl chloride with green vapour

B
chromous chloride with white vapour

C
chromous chloride with blue vapour

D
chromyl chloride with deep red vapour
Question 19
1 / -0

Transition metals with highest melting point is

A
Cr

B
Hg

C
Sc

D
W

Solution

The high melting points of these metals are attributed to the involvement of greater number of electrons from (n-1)d in addition to the ns electrons in the interatomic metallic bonding. W belongs to 5d series and it has lot of unpaired electrons (5d⁴6s²).
Question 20
1 / -0

The element that can reduce steam to hydrogen is

A
Fe

B
Pt

C
Pd

D
Tl
Question 21
1 / -0

Which is the most stable oxidation state of iron?

A
+1

B
+2

C
0

D
+3

Solution

Fe has d⁵ configuration in +3 oxidation state.
Question 22
1 / -0

Scandium in the 3d series has the lowest density because

A
it has low magnetic moment

B
it has relatively empty 3d subshell

C
it forms colourless salts

D
it has low ionization energy
Question 23
1 / -0

ZnSO₄(aq) is colourless, but CuSO₄(aq) is coloured because

A
Zn²⁺ has unpaired electrons, while Cu²⁺ does not

B
Cu has an unpaired electron in the 4s-orbital, but Zn²⁺ does not

C
Cu²⁺ has incompletely filled d-orbitals

D
Zn²⁺ has incompletely filled d-orbitals
Question 24
1 / -0

Which of the following elements of the 3d series respectively have the highest and lowest melting points?

A
Mn and Cu

B
Cr and Zn

C
Cr and Cu

D
Mn and Zn
Question 25
1 / -0

Lanthanoids are soft metals with a silvery white sheen. The exception to this fact is

A
La

B
Sm

C
Ce

D
Pr

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d-Block and f-Block Elements Test - 5

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d-Block and f-Block Elements Test - 5

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Question 1

50% Ce and 25% La

40% La and 50% Ce

50% La and 50% Ce

40% La and 40% Ce

Question 2

Cr

Cd

Zn

Hg

Solution

Question 3

Sc, Ti

Cu, Zn

Cr, Mn

Zr, Hf

Question 4

Titanium

Scandium

Cobalt

Zinc

Solution

Question 5

Br- and Br2

Cl- and CrO2Cl2

I- and CrO2Cl2

F- and Cl2

Question 6

Zinc

Cadmium

Zirconium

Silver

Solution

Question 7

ns + (n - 1)d electrons

ns + np electrons

ns + (n + 1)d electrons

ns + np + (n + 1)d electrons

Question 8

Cu has only one electron in the 4s orbital

Zn has a stable configuration and a greater effective nuclear charge

paramagnetic species are ionized less readily

electrons in Zn atom face greater repulsions

Question 9

Sm and Pr

Nd and La

Eu and Pr

Pr and Nd

Question 10

presence of empty orbitals in the valence shell

high charge density

Both (1) and (2)

None of these

Question 11

Mn2O7

CrO5

MnO2

Cr2O3

Question 12

their paramagnetic nature

their high melting points

comparable sizes of their atoms

their electrical conductivities

Question 13

Both are diamagnetic.

Both have the same magnetic moment.

Both have the same electronic configuration.

Both have the same number of 3d electrons.

Question 14

5

4

2

Br^- and Br₂

Cl^- and CrO₂Cl₂

I^- and CrO₂Cl₂

F^- and Cl₂

Mn₂O₇

CrO₅

MnO₂

Cr₂O₃

Cr₂O₇^2-

both Cr₂O₇^2- and CrO₄^2-

CrO₄^2-

Zn²⁺ has unpaired electrons, while Cu²⁺ does not

Cu has an unpaired electron in the 4s-orbital, but Zn²⁺ does not

Cu²⁺ has incompletely filled d-orbitals

Zn²⁺ has incompletely filled d-orbitals