d and f-Block Elements Test

Result

d and f-Block Elements Test - 8

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Question 1/9
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Though Zn (125 pm) has a higher atomic radius than Cu (117 pm), yet it has a higher value of first ionization energy because

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A
Cu has only one electron in the 4s orbital

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

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C
paramagnetic species are ionized less readily

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D
electrons in Zn atom face greater repulsions

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Solutions

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 2/9
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Which of the following pairs has comparable values of atomic radii as well as ionization energies?

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A
Sc, Ti

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B
Cu, Zn

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C
Cr, Mn

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D
Zr, Hf

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Solutions

Elements of the 4d and 5d series have comparable atomic radii as well as ionization energies because of lanthanoid contractions.
Question 3/9
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Which of the following statements is true about nickel and titanium ions in their +2 oxidation states?

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A
Both are diamagnetic.

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B
Both have the same magnetic moment.

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C
Both have the same electronic configuration.

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D
Both have the same number of 3d electrons.

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Solutions

Ni²⁺: [Ar], 3d⁸, 4s⁰
Ti²⁺: [Ar], 3d², 4s⁰
Both have 2 unpaired electrons and a magnetic moment of 2.82 BM.
Question 4/9
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Which of the following give the highest possible oxidation state of a transition element?

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A
ns + (n - 1)d electrons

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B
ns + np electrons

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C
ns + (n + 1)d electrons

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D
ns + np + (n + 1)d electrons

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Solutions

Both ns and (n - 1) d electrons participate in chemical bonding.
Question 5/9
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Which of the following elements of the 3d series respectively have the highest and lowest melting points?

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A
Mn and Cu

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B
Cr and Zn

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C
Cr and Cu

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D
Mn and Zn

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Solutions

The metallic bond is the strongest in Cr with six unpaired electrons and the weakest in Zn with no unpaired electrons.
Question 6/9
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Transition elements can form alloys with other elements due to

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A
their paramagnetic nature

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B
their high melting points

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C
comparable sizes of their atoms

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D
their electrical conductivities

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Solutions

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 7/9
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Scandium in the 3d series has the lowest density because

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A
it has low magnetic moment

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B
it has relatively empty 3d subshell

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C
it forms colourless salts

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D
it has low ionization energy

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Solutions

Sc has only one electron in the d-subshell and hence, it has low density.
Question 8/9
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Which of the following is not a property of transition elements?

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A
High value of ionization enthalpy

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B
Paramagnetism

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C
High heat of hydration

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D
High heat of sublimation

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Solutions

Transition elements have a low heat of hydration.
Question 9/9
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ZnSO₄(aq) is colourless, but CuSO₄(aq) is coloured because

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

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

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C
Cu²⁺ has incompletely filled d-orbitals

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D
Zn²⁺ has incompletely filled d-orbitals

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Solutions

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

Question 1/9

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 2/9

Sc, Ti

Cu, Zn

Cr, Mn

Zr, Hf

Question 3/9

Both are diamagnetic.

Both have the same magnetic moment.

Both have the same electronic configuration.

Both have the same number of 3d electrons.

Question 4/9

ns + (n - 1)d electrons

ns + np electrons

ns + (n + 1)d electrons

ns + np + (n + 1)d electrons

Question 5/9

Mn and Cu

Cr and Zn

Cr and Cu

Mn and Zn

Question 6/9

their paramagnetic nature

their high melting points

comparable sizes of their atoms

their electrical conductivities

Question 7/9

it has low magnetic moment

it has relatively empty 3d subshell

it forms colourless salts

it has low ionization energy

Question 8/9

High value of ionization enthalpy

Paramagnetism

High heat of hydration

High heat of sublimation

Question 9/9

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

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