d and f-Block Elements Test

Result

d and f-Block Elements Test - 8

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
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

Solution

Though Zn (125 pm) has a higher atomic radius than Cu (117 pm), yet it has a higher value of first ionization energy because Zn has a stable configuration and a greater effective nuclear charge.
Question 2
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

Solution

Elements of the 4d and 5d series have comparable atomic radii as well as ionization energies because of lanthanoid contractions.
Question 3
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.

Solution

Ni²⁺: [Ar], 3d⁸, 4s⁰
Ti²⁺: [Ar], 3d², 4s⁰
Both have 2 unpaired electrons and a magnetic moment of 2.82 BM.
Question 4
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

Solution

Both ns and (n - 1) d electrons participate in chemical bonding.
Question 5
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

Solution

The metallic bond is the strongest in Cr with six unpaired electrons and the weakest in Zn with no unpaired electrons.
Question 6
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

Solution

Transition elements can form alloys due to their comparable atomic sizes. The atoms of one element can replace those of the other without affecting the lattice strength.
Question 7
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

Solution

Sc has only one electron in the d-subshell and hence, it has low density.
Question 8
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

Solution

Transition elements have a low heat of hydration.
Question 9
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

Solution

Due to the presence of incompletely filled d-orbitals, Cu²⁺ is coloured as the electrons exhibit d-d transitions.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

d and f-Block Elements Test - 8

Result

d and f-Block Elements Test - 8

Score

-

Rank

-

SHARING IS CARING

Question 1

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

Solution

Question 2

Sc, Ti

Cu, Zn

Cr, Mn

Zr, Hf

Solution

Question 3

Both are diamagnetic.

Both have the same magnetic moment.

Both have the same electronic configuration.

Both have the same number of 3d electrons.

Solution

Question 4

ns + (n - 1)d electrons

ns + np electrons

ns + (n + 1)d electrons

ns + np + (n + 1)d electrons

Solution

Question 5

Mn and Cu

Cr and Zn

Cr and Cu

Mn and Zn

Solution

Question 6

their paramagnetic nature

their high melting points

comparable sizes of their atoms

their electrical conductivities

Solution

Question 7

it has low magnetic moment

it has relatively empty 3d subshell

it forms colourless salts

it has low ionization energy

Solution

Question 8

High value of ionization enthalpy

Paramagnetism

High heat of hydration

High heat of sublimation

Solution

Question 9

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

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

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