The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

Identify the incorrect statement in the following

A
d block elements show irregular and erratic chemical properties among themselves.

B
La and Lu have partially filled d-orbital and no other partially filled orbital.

C
The chemistry of various Lanthanoids is similar.

D
4f and 5f orbitals are equally shielded.
Question 2
1 / -0

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of $$[Fe(H_2O)_6]_2$$ and $$[Fe(CN)_6]$$, respectively, are:

A
$$4.9$$ and $$0$$

B
$$2.84$$ and $$5.92$$

C
$$0$$ and $$4.9$$

D
$$0$$ and $$5.92$$

Solution

Solution:- (C) $$0$$ and $$4.9$$

Complex is $$[Fe(H_2O)_6]_2 [Fe(CN)_6]$$

Complex ion
Configuration
No. of unpaired electrons
Magnetic moment
$$[Fe(H_2O)_6]^{2+}$$

$$[Fe(CN)_6]^{4-}$$ $$t_{2g}^4 \,e_g^2$$

$$t_{2g}^6 \,e_g^0$$ $$4$$

$$0$$ $$4.9 \,BM$$

$$0$$
Question 3
1 / -0

$$\left[ Cr\left( { H }_{ 2 }O \right) _{ 6 }{ Cl }_{ 3 } \right] $$ has a magnetic moment of 3.83 BM. The correct distribution of 3d electrons in the chromium atom in the complex is:

A
$${ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ { z }^{ 2 } }^{ 1 }$$

B
$${ 3d }_{ \left( { x }^{ 2 }-{ y }^{ 2 } \right)} ^1 ,{ 3d }_{ z^2 }^{ 1 },{ 3d }_{ xz }^{ 1 }$$

C
$${ 3d }_{ xy }^{ 1 },{ 3d }_{ \left( { x }^{ 2 }-{ y }^{ 2 } \right) }^1,{ 3d }_{ z }^{ 1 }$$

D
$${ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ { xz } }^{ 1 }$$
Question 4
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For which of the following elements all of its existing ion, $$M^{x+}$$, will be diamagnetic?

A
$$Cu$$

B
$$Fe$$

C
$$Cr$$

D
$$Na$$

Solution

A neutral sodium atom is likely to achieve an octet in its outermost shell by losing its one valence electron. The cation produced in this way is Na$$^+$$, having electronic configuration [Ne] 3s$$^0$$ which means there is no unpaired electron.

Hence, Na is diamagnetic in its existing ion form.
Question 5
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Match the catalysts (Column I) with products column (II)
Column I Column II
(A) $${V}_{2}{O}_{5}$$ (i) Polyethylene
(B) $$Ti{Cl}_{4}/Al{(Me)}_{3}$$ (ii) ethanal
(C) $$Pd{Cl}_{2}$$ (iii) $${H}_{2}{SO}_{4}$$
(D) Iron Oxide (iv) $${NH}_{3}$$

A
(A)- (ii); (B)- (iii); (C)- (i); (D)- (iv)

B
(A)- (iii); (B)- (i); (C)- (ii); (D)- (iv)

C
(A)- (iii); (B)- (iv); (C)- (i); (D)- (ii)

D
(A)- (iv); (B)- (iii); (C)- (ii); (D)- (i)

Solution

$$V_2O_5$$ is used as a catalyst in contact process for $$H_2SO_4$$

$$TiCl_4/Al(Me)_3 is used as a catalyst in Ziegler Natta salt used as the catalyst for polymerisation of ethane to produce Polyethylene

$$PdCl_2 \rightarrow$$ used as catalyst for ethanal (Wacker process)

Iron oxide $$\rightarrow$$ is used as a catalyst in Haber's synthesis of ammonia.

Hence, the correct option is $$D$$
Question 6
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Consider the hydrates ions of $$Ti^{2+}, V^{2+}, Ti^{3+}$$ and $$Sc^{3+}$$. The correct order of their spin-only magnetic moments is:

A
$$Sc^{3+} < Ti^{3+} < Ti^{2+} < V^{2+}$$

B
$$Ti^{3+} < Ti^{2+} < Sc^{3+} < V^{2+}$$

C
$$Sc^{3+} < Ti^{3+} < V^{2+} < Ti^{2+}$$

D
$$V^{2+} < Ti^{2+} < Ti^{3+} < Sc^{3+}$$

Solution

Solution:- (A) $$Sc^{3+} < Ti^{3+} < Ti^{2+} < V^{2+}$$

$$a)\ Ti^{2+} = 1s^2 2s^2 2p^6 3s^2 3p^6 3d^2$$

Unpaired electrons $$=2$$

Spin only magnetic moment $$(\mu) = \sqrt{2(2+2)}$$
$$=\sqrt{8} B.M$$

$$b)\ Ti^{3+} = 1s^22s^22p^6 3s^2 3p^6 3d^1$$

Unpaired electrons $$=1$$

$$\mu =\sqrt{1(1+2)} = \sqrt{3} B.M$$

$$c)\ V^{2+} = 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3$$

$$\mu = \sqrt{3(3+2)} = \sqrt{15} B.M$$

$$d)\ Sc^{3+} = 1s^2 2s^2 2p^6 3s^2 3p^6$$

$$\mu = 0$$
Question 7
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In the hydrogenenation of oil :-

A
$$Ni$$ acts as a promoter

B
$$Cu$$ acts as a catalyst

C
Tellurium acts as a promoter

D
$$Ni$$ acts as a catalyst

Solution

Nickel is the preferred catalyst for hydrogenation of fats and oils, hence option (D) is correct.
Question 8
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Photochromic glass, used for sunglasses, darkens when exposed to bright light and becomes
more transparent again when the light is less bright. The darkness of the glass is related to the
concentration of silver atoms.
The following reactions are involved.
reaction 1 $$Ag^{+} + Cl^{-}\rightleftharpoons Ag + Cl$$
reaction 2 $$Cu^{+} + Cl \rightarrow Cu^{2+} + Cl^{-}$$
reaction 3 $$Cu^{2+} + Ag \rightarrow Cu^{+} + Ag^{+}$$
Which statement about these reactions is correct?

A
$$Cu^{+}$$ and $$Cu^{2+}$$ ions act as catalysts

B
$$Cu^{+}$$ ions act as an oxidising agent in reaction $$2$$

C
Reaction $$3$$ increases the darkness of the glass

D
Silver atoms are reduced in reaction $$3$$

Solution

Statement $$1$$ is correct as the $${Cu}^{2+}$$ and $${Cu}^{+}$$ ions are regenerated at the end of reactions $$2$$ and $$3$$ respectively, hence they act as catalysts.
Statement $$2$$ is incorrect as the oxidation number of $$Cl$$ changes from $$0$$ to $$-1$$, hence the $${Cu}^{+}$$ ions act as a reducing agent.
Statement $$3$$ is incorrect as silver atoms are converted to silver ions. Silver atoms increase the darkness of the glass whereas silver ions cause the glass to become more transparent.
Statement $$4$$ is incorrect as the oxidation number of silver increases from $$0$$ to $$+1$$, hence the silver atoms are oxidised.
Question 9
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The INCORRECT statement is:

A
The spin - only magnetic moments of $$[Fe(H_{2}O)_{6}]^{2+}$$ and $$[Cr(H_{2}O)_{6}]^{2+}$$ are nearly similar

B
The spin-only magnetic moment of $$[Ni(NH_{3})_{4}(H_{2}O)_{2}]^{2+}$$ is $$2.83\ BM$$

C
The gemstone, ruby, has $$Cr^{3+}$$ ions occupying the octahedral sites of beryl

D
The color of $$[CoCl (NH_{3})_{5}]^{2+}$$ is violet as it absorbs the yellow light

Solution

(1) $$[Fe(H_{2}O)_{6}]^{2+}, Fe^{2+} \rightarrow 3d^{6} \rightarrow 4$$ unpaired electron

$$[Cr(H_{2}O)_{6}]^{2+}, Cr^{2+}\rightarrow 3d^{4}\rightarrow 4$$ unpaired electron

(2) $$[Ni(NH_{3})_{4}(H_{2}O)_{2}]^{2+} ,\ Ni^{2+}\rightarrow 3d^{8}\rightarrow 2$$ unpaired electron

$$\mu_{m} = 2.83\ B.M$$

(3) In gemstone, ruby has $$Cr^{3+}$$ ion occupying the octahedral sites of aluminium oxide $$(Al_{2}O_{3})$$ normally occupied by $$Al^{3+}$$ ion.

(4) The complementary color of violet is yellow.
Question 10
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Select the paramagnetic complex compound.

A
$$K_4[Fe(CN)_5O_2]$$

B
$$Fe(CO)_5$$

C
$$[Cr(NH_3)_6]^{3+}$$

D
$$[Ni(CN)_6]^{4-}$$

Solution

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Complex ion	Configuration	No. of unpaired electrons	Magnetic moment
$$[Fe(H_2O)_6]^{2+}$$ $$[Fe(CN)_6]^{4-}$$	$$t_{2g}^4 \,e_g^2$$ $$t_{2g}^6 \,e_g^0$$	$$4$$ $$0$$	$$4.9 \,BM$$ $$0$$

Column I	Column II
(A) $${V}_{2}{O}_{5}$$	(i) Polyethylene
(B) $$Ti{Cl}_{4}/Al{(Me)}_{3}$$	(ii) ethanal
(C) $$Pd{Cl}_{2}$$	(iii) $${H}_{2}{SO}_{4}$$
(D) Iron Oxide	(iv) $${NH}_{3}$$

The d- and f- Block Elements Test - 66

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The d- and f- Block Elements Test - 66

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Question 1

d block elements show irregular and erratic chemical properties among themselves.

La and Lu have partially filled d-orbital and no other partially filled orbital.

The chemistry of various Lanthanoids is similar.

4f and 5f orbitals are equally shielded.

Question 2

$$4.9$$ and $$0$$

$$2.84$$ and $$5.92$$

$$0$$ and $$4.9$$

$$0$$ and $$5.92$$

Solution

Question 3

$${ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ { z }^{ 2 } }^{ 1 }$$

$${ 3d }_{ \left( { x }^{ 2 }-{ y }^{ 2 } \right)} ^1 ,{ 3d }_{ z^2 }^{ 1 },{ 3d }_{ xz }^{ 1 }$$

$${ 3d }_{ xy }^{ 1 },{ 3d }_{ \left( { x }^{ 2 }-{ y }^{ 2 } \right) }^1,{ 3d }_{ z }^{ 1 }$$

$${ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ { xz } }^{ 1 }$$

Question 4

$$Cu$$

$$Fe$$

$$Cr$$

$$Na$$

Solution

Question 5

(A)- (ii); (B)- (iii); (C)- (i); (D)- (iv)

(A)- (iii); (B)- (i); (C)- (ii); (D)- (iv)

(A)- (iii); (B)- (iv); (C)- (i); (D)- (ii)

(A)- (iv); (B)- (iii); (C)- (ii); (D)- (i)

Solution

Question 6

$$Sc^{3+} < Ti^{3+} < Ti^{2+} < V^{2+}$$

$$Ti^{3+} < Ti^{2+} < Sc^{3+} < V^{2+}$$

$$Sc^{3+} < Ti^{3+} < V^{2+} < Ti^{2+}$$

$$V^{2+} < Ti^{2+} < Ti^{3+} < Sc^{3+}$$

Solution

Question 7

$$Ni$$ acts as a promoter

$$Cu$$ acts as a catalyst

Tellurium acts as a promoter

$$Ni$$ acts as a catalyst

Solution

Question 8

$$Cu^{+}$$ and $$Cu^{2+}$$ ions act as catalysts

$$Cu^{+}$$ ions act as an oxidising agent in reaction $$2$$

Reaction $$3$$ increases the darkness of the glass

Silver atoms are reduced in reaction $$3$$

Solution

Question 9

The spin - only magnetic moments of $$[Fe(H_{2}O)_{6}]^{2+}$$ and $$[Cr(H_{2}O)_{6}]^{2+}$$ are nearly similar

The spin-only magnetic moment of $$[Ni(NH_{3})_{4}(H_{2}O)_{2}]^{2+}$$ is $$2.83\ BM$$

The gemstone, ruby, has $$Cr^{3+}$$ ions occupying the octahedral sites of beryl

The color of $$[CoCl (NH_{3})_{5}]^{2+}$$ is violet as it absorbs the yellow light

Solution

Question 10

$$K_4[Fe(CN)_5O_2]$$

$$Fe(CO)_5$$

$$[Cr(NH_3)_6]^{3+}$$

$$[Ni(CN)_6]^{4-}$$

Solution

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