The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 26

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Weekly Quiz Competition

Question 1
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The position in the periodic table to which the $$Al$$ metal belongs :

A
Alkali metals

B
Alkaline earth metals

C
$$d$$ - block elements

D
$$p$$ - block elements

Solution

Electronic configuration of aluminium is $$[Ne] 3s^{2}3p^{1}$$.
In the above configuration, the valence electron enters into p-orbital. So $$Al$$ is a p-block element.
Hence option D is correct.
Question 2
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Which one of the following forms a colorless solution in aqueous medium?

A
$${Cr}^{3+}$$

B
$${Ti}^{3+}$$

C
$${Sc}^{3+}$$

D
$${V}^{3+}$$

Solution

$$Cr^{3+}$$ = $$3d^3$$ = coloured

$$Ti^{3+}$$ = $$3d^1$$ = coloured

$$V^{3+}$$ = $$3d^2$$ = coloured

$$Sc^{3+}$$ has electron configuration of [Ar] $$4s^0 3d^0$$. Therefore without any unpaired electrons it forms a colorless solution in aqueous medium.
Question 3
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Which of the following electronic configuration will be associated with the lowest magnetic moment?

A
$${ d }^{ 2 }$$

B
$${ d }^{ 3 }$$

C
$${ d }^{ 4 }$$

D
$${ d }^{ 9 }$$

Solution

The magnetic moment, $$ \mu_s = \sqrt {n(n+2)} \mu_B$$ where n is the number of unpaired electrons.

$$ d^2$$ has 2 unpaired electrons, $$ d^3$$ has 3 unpaired electrons, $$ d^4$$ has 4 unpaired electrons and $$ d^9$$ has 1 unpaired electron.

Hence $$ d^9$$ will have the lowest magnetic moment.
Question 4
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Magnetic moments of $$Cr(Z=24)$$, $${Mn} (Z=25)$$ and $${Fe}(Z=26)$$, are $$x ,y , z$$.

They are in order:

A
$$x< y< z$$

B
$$x=y< z$$

C
$$ x>y>z$$.

D
$$x=y=z$$

Solution

n = number of unpaired electrons. Greater the number of unpaired electrons, greater will be the magnetic moment.

$$ Cr$$ = 6 unpaired electron

$$ Mn$$ = 5 unpaired electron

$$Fe$$ = 4 unpaired electron
.
Therefore the order of magnetic moment is $$ x>y>z$$.

Hence,option C is correct.
Question 5
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Which of the following elements do not show the properties characteristics of $$d$$-block elements:

A
$$Cu,Ag,Au$$

B
$$Zn,Hg,Cd$$

C
$$Sc,Ti,V$$

D
$$Fe,Co,Ni$$

Solution

All are d-block elements except zinc, cadmium and mercury have partially filled d-orbitals. But, zinc, cadmium and mercury have completely filled d-orbitals and they exhibit common oxidation state.
Question 6
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Which of the ions will give colorless aqueous solution?

A
$${Ni}^{2+}$$

B
$${Fe}^{2+}$$

C
$${Cu}^{2+}$$

D
$${Cu}^{+}$$

Solution

$${Ni}^{2+}$$ is light green, $${Fe}^{2+}$$ is pale green,

$${Cu}^{2+}$$ is blue and $${Cu}^{1+}$$ is colorless in aqueous solution as its outermost configuration is $$3d^{10}$$ so thei is no unpaired electron which causes colour.

Hence ,option D is correct.
Question 7
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Which of the following belongs to the actinoids series of elements?

A
$$Y$$

B
$$Ta$$

C
$$U$$

D
$$P$$

Solution

$$ _{92}U$$, Uranium, is a part of the actinoids series of elements.
Question 8
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Maximum magnetic moment is shown by:

A
$${d}^{5}$$

B
$${d}^{6}$$

C
$${d}^{7}$$

D
$${d}^{8}$$

Solution

Magnetic moment increases with the increase in number of unpaired electrons.

$$ d^5$$ has 5 unpaired electrons .

$$ d^6$$ has 4 unpaired electrons

$$d^7$$has 3 unpaired electrons

$$ d^8$$ has 2 unpaired electrons.

Hence,option A is correct.
Question 9
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Arrange the following ions in order of their magnetic moment:

$$(i) {V}^{4+}$$ $$(ii) {Mn}^{4+}$$ $$(iii) {Fe}^{3+}$$ $$(iv){Ni}^{2+}$$

[Atomic number of $$V=23, Mn=25,Fe=26,Ni=28$$]

A
$$(ii)> (iii)> (i)> (iv)$$

B
$$(iii)> (ii)> (iv)> (i)$$

C
$$(i)> (iv)> (iii)> (ii)$$

D
$$(iv)> (iii)> (i)> (ii)$$

Solution

The transition metal with more unpaired electrons corresponds to the higher magnetic moment.

$$ V^{4+}\rightarrow4s^0 3d^1$$, 1 unpaired electron;

$$ Mn^{4+}\rightarrow4s^0 3d^3$$, 3 unpaired electron;

$$ Fe^{3+}\rightarrow4s^0 3d^5$$, 5 unpaired electron and

$$ Ni^{2+}\rightarrow4s^0 3d^8$$, 2 unpaired electron.

Hence, option B is correct.
Question 10
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Lanthanoids contraction is caused due to:

A
the same effective nuclear charge from $$Ce$$ to $$Lu$$

B
the imperfect shielding of outer electrons by $$4f$$ electrons from the nuclear charge

C
the appreciable shielding of outer electrons by $$4f$$-electrons from the nuclear charge

D
the appreciable shielding of outer electrons by $$5d$$-electrons from the nuclear charge

Solution

The imperfect shielding of outer s orbital electrons by 4f electrons from the nuclear charge results in greater than expected decrease in ionic radii of the elements in the lanthanide series known as lanthanide contraction.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 26

Result

The d- and f- Block Elements Test - 26

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Question 1

Alkali metals

Alkaline earth metals

$$d$$ - block elements

$$p$$ - block elements

Solution

Question 2

$${Cr}^{3+}$$

$${Ti}^{3+}$$

$${Sc}^{3+}$$

$${V}^{3+}$$

Solution

Question 3

$${ d }^{ 2 }$$

$${ d }^{ 3 }$$

$${ d }^{ 4 }$$

$${ d }^{ 9 }$$

Solution

Question 4

$$x< y< z$$

$$x=y< z$$

$$ x>y>z$$.

$$x=y=z$$

Solution

Question 5

$$Cu,Ag,Au$$

$$Zn,Hg,Cd$$

$$Sc,Ti,V$$

$$Fe,Co,Ni$$

Solution

Question 6

$${Ni}^{2+}$$

$${Fe}^{2+}$$

$${Cu}^{2+}$$

$${Cu}^{+}$$

Solution

Question 7

$$Y$$

$$Ta$$

$$U$$

$$P$$

Solution

Question 8

$${d}^{5}$$

$${d}^{6}$$

$${d}^{7}$$

$${d}^{8}$$

Solution

Question 9

$$(ii)> (iii)> (i)> (iv)$$

$$(iii)> (ii)> (iv)> (i)$$

$$(i)> (iv)> (iii)> (ii)$$

$$(iv)> (iii)> (i)> (ii)$$

Solution

Question 10

the same effective nuclear charge from $$Ce$$ to $$Lu$$

the imperfect shielding of outer electrons by $$4f$$ electrons from the nuclear charge

the appreciable shielding of outer electrons by $$4f$$-electrons from the nuclear charge

the appreciable shielding of outer electrons by $$5d$$-electrons from the nuclear charge

Solution

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